I don't know your situation but for me I put aside a little every pay to put toward crypto. It builds up and you can then but small amounts of coins. Also do some airdrops and bounty campaigns. again small amounts but they can build and if you do enough when you put them all together you will have some $$ to buy btc.
The only thing which can help you in earning of some good amount of money when it comes to that of the crypto currencies, then the very first thing which comes in your mind is having some good awareness regarding the crypto currency and that having some sufficient technical knowledge regarding the things. The investment amount comes at later part and that you need to start with the small amount of money.