We can buy bitcoin according to our ability and money. Maybe by buying gradually, we can finally have a large amount of bitcoin. As you said, Binance has given flexibility to buy bitcoin with a small nominal and we can start investing there.
There are many things that can be done in crypto to get rewards for bitcoin investment capital, so take every opportunity, airdrops and bounties are a great way.
What I personally prioritize is to always invest in Bitcoin for the long term and of course invest the investment with our own funds that we will not need in a few years.
And at the same time, invest in such a way that even in an emergency situation, I don't have to touch my Bitcoin investment.
Another important thing that is most effective is to follow the DCA (Dollar cost averaging) scheme for the long term and I won't say to increase the investment amount, but if you regularize the investment amount that you want to make, then you will see that after a while, a huge amount has accumulated in your bitcoin adoption.