What Ever you do it now just get better on this you don't need to search for things what to start just improve things what you have now.
I don't understand what you are talking about, how can someone become rich with a lot of money in a side job, as far as I know crypto is not a job, how do you say crypto is a side job, what do you mean.
If you mean trading, investing in crypto, that's not a job, if you enter the world of crypto, it means you are ready to face the risk of losing, not gaining wealth or economics, not everyone will understand trading or investing, so those who have the knowledge cando it all.
If you want to be rich, open your own business or business, not a side job, by doing business you will determine your own destiny to become rich, you have control in mobilizing your own finances to become rich or poor.