It's not easy to make short time gains using bitcoin, due to transaction prices. The best way to go about this is to buy, and wait for the price to incease, like pretty much every other investment.

Go for a long term investment if you really want to join with the ride. Bitcoin has so much journey ahead so I think it is not really late to join. Buy coins that you can afford to and hold them. Even if they are just a fraction of bitcoin, they have worths and holding them will make them grow if you got it right.

if you are familiar with margin trading,... you can always short altcoins that are dropping hard during the bitcoin rise and enjoy the profit you gain. and then any profit that you make you can invest in bitcoin so you have more bitcoin before the new record is set and new ATH is reached. that way you have more profit than just buying bitcoin directly.

It was good to buy when it dropped at 5900$

Bitcoin price is about to peak, if you want to make profit, you can try to short it when  you noticed that it is about to make a correction. Then buy back again. It is the only way I can think that can maximize your profit  from what you have except from holding long term.

Correct. With every ATH, it means that if you bought at any of the last 10/20/50 ATHs, you still made a profit. If you are buying and holding long term (years) the price you buy at the moment matters much less than if you are trying to day trade.

Sell atleast half of your bitcoin at current price range and hold half to sell at much higher price. Alternatively you can use fiat you will get after selling your bitcoin to buy few altcoins whose value is quite dumped after pump in bitcoin and wait for some correction in bitcoin's price.

You might get very good profit in this way and in the mean time your risk of lossing so much during correction after huge pump will be quite low.

If you are looking to hold BTC for long term, then just buy now. It is hard to catch BTC price but most of the time, it is rising.

When there is bad news, BTC price might dip, but you can’t be waiting for bad news to come and the price might just keep increasing.

this is the riskiest time you could possibly invest. yes, there is a very strong chance that bitcoin will continue up to 10k, but there is not guarantee of how long that will take, and how long we will stay there. these price levels are absurd, and im starting to fear that what I thought was excessive but genuine enthusiasm, might actually be one of the most epic pump and dumps that I have seen in recent memory. we just keep going up people, on good new, bad news, fuck it sometimes no news. this price has no justification. I hate to sound like the bank bros, but as we near 10k for no good damn reason I have to wonder:

how long is this going to last, in this state?

Well, if you have thought about it a week ago, you could have easily bought Bitcoins at a 150$ cheap rate (When bitcoin was dumping) and by now (when it is near its all time peak value), you could have gained the profits already.  Anyways, if you are long time holder, i would suggest to wait for few days and if you see market being to crash, buy some coins according to you budget and keep them save for the year end. I hope bitcoin will cross 10K by this year end.