If no one ever did something because "a lot of others are already doing it" there'd never be any new musicians, writers, artists... etc.
Anyone may excel at anything pushing them ahead of the "tons of others" already doing the same things.
Whether or not something is worth your time is for you to decide. However, traditionally, "others are already doing it" is not good reason to not do something.
In terms of financial return, well, then it all depends on how adept, comfortable, and proficient you are with something and how quickly you expect to make a return. In a saturated market, even if your kung fu is strong, it may take awhile before you can make headway. However, if your expectations are realistic, there's no reason to not move ahead with something which interests you. Every day you delay is a delay in returns.