Bitcoin is actually the end game of my investment, I won't convert it to real estate, land or business.

Renting real estate or land? I can earn more just by investing in Bitcoin.
Business? I don't have time to manage it.

Not to mention I would face unnecessary dramas e.g. they claimed to own my land, I could be scammed, the lessee don't want to pay the rent, cost to maintenance the real estate etc.

I only sell my coins to accumulate more coins.

It's a good idea to use your Bitcoin holdings' profit to diversify your investments even more among another niches of the market. You have mentioned some very good examples, like real estate, commercial businesses, purchasing pieces of land and renting it for passive income. There are many areas you can invest and make new sources of income from. You just have to be careful to invest in the kinds of areas which are more profitable inside the local reality you live, that is, areas which have high demand from the public around you.

For an example: you won't invest in commercial businesses where local residents don't have financial power to consume your services or products, however this concept of business is a very good idea where the population has better financial conditions to spend more often in a daily basis.

Therefore, someone's idea of investment might not be the most accurate one for you, because your realities can be immensely different between each other. For that reason, you are the one who has to develop the best ideas on how to spend your money for further gains.

To be honest I do not have accumulated a lot just yet or at least not enough for any of my plans to happen just yet.

There are two specific things I have in my mind: real estate and business. I want to build a house it has always been a dream of mine and if I earn enough profit it will surely be one of the first things I would be doing. With business, I actually just mean that I want to be able to make more of what I earned. I can not be satisfied with the money that I have I know I should think of more ways to double my profit.

Good question. Basically we always plan how we will earn profit from our invested funds, I can guarantee that there are most of us who will get confused to answer what to do with the profit earned from the invested funds.  Because most of us don't plan what to do with the profits.
And to be honest with me it's pretty much the same, I've been confused about it all this time but I'm thinking that since I'm currently thinking of holding bitcoins until around two halvings following the DCA method.  Later, the thought of reinvesting may come to my mind. However, I don't have any thoughts of doing business or anything else with that profit. I don't know what will happen in the future.

If I had to sell all my Bitcoins just to create a business that generates passive income, I wouldn't do it. Because for me as long as Bitcoin continues to provide good returns for me, I will continue to keep it and also continue to buy it as long as I have the ability to continue buying Bitcoin. Because I think Bitcoin will continue to give me good profits in the long term which makes me have to think long and have to really plan very carefully if I want to create a business, because creating a profitable business takes a long time.
If I use my Bitcoin to create a new business, I have to sell my Bitcoin and have to wait a long time for my capital to return and even then it hasn't made a profit. And that time has squandered any profit I could have made from Bitcoin if I still had Bitcoin, and that profit would have been pure profit and probably a very large amount. So I have to really think about this so that I don't regret it and I also don't need passive income other than my salary from work. Because the income from my job is enough to meet all my needs and also to invest in Bitcoin periodically according to my ability after all my important needs are met, and I prioritize Bitcoin for my future or old age and also believe that in the future Bitcoin will be very expensive .

 
Although you said that you are also a holder, I will like to ask you a question: as a holder, do you think it is a good strategy to sell all your bitcoin that you have been patiently holding for a long period of time to invest in a business that you are not 100% sure will succeed?

Take a deep look at it without working, Just being patient By holding bitcoin for a long time, you will make a profit. Didn't that look so easy to do? I know another source of income is good, but what is the essence of selling all your investments? Why not sell 1/4 or half of it to start up the business? If you keep getting higher profits, you will add more to your bitcoin investment, or do you think if you sell all your bitcoin investment, you will have interest in investing again? You might think it will be easy, but if the amount of bitcoin goes up, then you will feel discouraged because it will be like you have started your bitcoin investment from the beginning.
 
So if you truly want a good strategy, you should plan to start up a small business that will not consume more than 1/4 or half of all your investment, and even if the business fails, you will still have a backup.

Everyone has his own reason for holding and they can decide on when and how much they should continue holding or sell out, but i don't think there will be a long time holder till now that will want to sell all he has been holding till now, they will rather release part of it or also make an investment in other asset along the bitcoin investment, some of them do have the target that they are investing for the future and may not sell out at anytime soon since they believe in the value of the coin and future prospect it has.

I am a holder however it is not as long as you think. That makes me qualified to respond too. I have big dreams for what I'll do when I take profits but it is nothing too concrete. Plans can change so that is what I have in mind. Also something may occur that will require me to take it out sooner than planned.

The sketchy thought I have in my head is to build a library in my society. The library will have almost a whole floor dedicated to Bitcoin, its history, its creator and its people.

Real estate and stocks. Unlikely Bitcoin, they have a very clear utility so they are always in demand and generate predictable cash flow. But in general I want a diversified and balanced portfolio that yields predictable and low risk income. When you have a lot of money, you don't need to chase high returns, you need to focus on consistency.

Well, if this question was asked directly, then I will simply say, after holding and finally selling, the next thing to do  if possible is to life your life as simple as that, but unfortunately, most holders haven’t even thought about selling atleast not this very moment when they’re seriously seeking ways and money to continue buying.

All the other investment options you mentioned are relevant but I don’t think, a core bitcoin investor would want to  sell his coin simply to go invest in some  other things not even this bull run.