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You won't unless you have great resource which can give you insight of the market.

TLDR: Yes, you will be able to..
It is just a matter of good discipline in trading. It will obviously take longer with USD100.
However, undisciplined traders given millions of dollars can quickly lose them too. History is full of examples of them. In short money is no replacement for knowledge.

As the saying goes "A fool and his money are soon parted." hold true.

Daytrading stock/forex is a bit more doable then Crypto's. Crypto's go hand in hand in swings and Forex/Stock is less likely that they will rise and fall all together.