... I invested with a small amount of money and from that small amount of money I lost like 5 dollars. ...
You are wrong. You do not lose anything if you don't sell. What happens between the point you buy and the point you sell doesn't matter.
What I began to do is to make a plan.
A plan may look like this:
- If BTC is below 25'000: invest a (small) amount every month
- If BTC is above 40'000: sell with a plan. For example: 10% at 40k, 10% at 50k and so on.
It's just an example. You have to find your numbers by yourself. Do your research to find them. Some may take more risk, some not.