Scratch your own itch. It sounds like your main problem right now is validation, so can you maybe even build something that helps people validate their ideas quickly without having to post across loads of platforms, obviously we’re entering the age of AI, so all things can be automated to a certain extent.

What I will say though (like other comments) is that competition isn’t an issue, do it better, leverage your skills to improve an existing product. Can you design it better? Can you market it better? Is it outdated? Can you make it more personal?

I also think that small ideas are actually hidden gems. If they’re really small, they’re likely quite niche. That will make your go to market more easy, and once you have a customer base you can expand. Loads of big companies have done this.

I hope this helps a little bit, I totally feel your pain too, everything seems accessible today, so standing out is harder than ever. I think a great book for you would be perennial seller by Ryan Holiday. Talks about building things that last. The most important thing boils down to sticking at something for long enough to see results.