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You can trade on Bitcoin, if you have enough money ability, I mean you buy when the price is low and sell when the price is high, it's a common method that people do and get good results.
You say that as if it were so easy, but it is absolutely not. Anyone who has tried to trade knows how difficult it is to time the market correctly and not to make any short-circuit actions (selling in panic, buying at the top because "it's still going up", ...).
Trading is very difficult, especially psychologically, and you must not allow yourself to deviate from your trading plan. It is definitely not as simple as "buy low sell high"!