I believe that every human being in this world has primary necessities as food, clothes and shelter.

And for these thing people do work or job or business or anything relate to service which offer them money in exchange of their efforts.

Have anyone ever think, for thing which we produce by contributing our time , energy, and efforts is sustainable.

No. Its durable.

Bitcoin gives good option for sustainable income source. As they can be generated by mining.

So in future there will be more value for bitcoin.

Yeah and the best thing is that it can be also earned in different ways and it is the only currency whose value keeps on growing over a period of time which is not possible with any other currency.

There is no shortcut to get rich,  if you want to get rich then you really need to work on it and you need to keep on making efforts continuously and you should never get satisfied with your earnings, you should always have hunger for money.

There is other way that you can earn bitcoins not only joining in community but there is other way.. but it takes a long time before you can see a good result.. blogging make your own website and advertise that you can earn massive income if you promote your site or even doing seo organic traffic from search engine..
It can help you to become reach in the future.

better to start trading now, with low capital, i think 0.01 it's enough for get more experience.
you can start trading at poloniex or bittrex both of them is good market with high volume.

Well that is going to be a good amount and start to your trading career. And that is going to be a good way to become rich with bitcoin. And every time you are going to earn with trading you can just try to invest it again and keep on rolling over it so that in your next trades you are going to earn more than you have earned before.

Starting a decent amount of capital is needed because that will give you an excitement in trading and for sure you will seriously manage your money in trading, however you need to consider that the decent amount we are talking here is the amount that you can afford to lose.

If you hold huge capital to invest but without knowledge it is useless, as you will definitely loose your money if you invest in trading, knowledge and skills are  mandatory in trading.

To play safe you need to diversify your investments to reduce the level of risk in future, so even if your one investment fail you can expect to recover your losses from the other  one.

That's a good plan but to make it reality you need to work really hard on it and yes 200 btc in a good amount to hold for the future and if someday I reach there then I will surely retire from my day job.