I have 20$ of bitcoin. What should i do with it instead of spending all.Tell me Pls.

Actually mate, that amount will increase in the future as you invested in bitcoin or other crypto currency as you believe have a potential. Well, honestly that anount is too small as you want to invest. Basically, if you want a great amount of profit you must also a great amount of investment which make sense to have a great profit. I believe on what I've been investes would have a great return in the future as you will set your investment for the long term and hold as much as possible for the long perion of time.