well i think you don't need to put a huge amount of money to start a trade and being profitable should not be your first objective in my opinion, successfully applying your knowledge and technical analysis on an actual trading must be your first objective and I guess $20 could be enough to start but before you enter this venture you need have further knowledge about cryptocurrency trading, investing your time more on getting knowledge could be good move you ever need to do in order learn and understand how much risks are there in crypto trading and how you should handle it on your own, improve your skills in technical analysis and maintaining your trading discipline. it's indeed that there are many expert traders in this forum and maybe they could share a little of their knowledge to you and other aspiring traders like you.