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

You might consider jnvesting more money into it because that amount won't give you that much profit. Make your investment bigger in order to earn bigger profit. From that, holding will be the next thing to do until the market stabilizes.During the market downfalls,selling won't be a good thing to do because it will just cut your profit down and would miss the opportunity to earn bigger profit once the market stabilizes at a high price.