That's actually a pretty small community (if you consider that only a small percentage of these users are active), I thought it's much bigger for some reason.

Hey! This looks really exciting! Would you mind sharing an invite so I could try it out?

This is my first website, built it for my mother's company less than 2 years ago (no prior development experience). http://questa.ru/

Hi! Don't think about idea too much. The most difficult part is execution, so you should take any idea you have now (even if somebody already did this) and build a product. Even if something exists, you can make it better. But again, execution is the most important part.

Also, create a list of ideas and update it regularly with all ideas you have (no matter how bad are they). For me, I always have thoughts like "I wish something existed", and then I immediately put this idea on my list. Then, when I'm ready to build something, I open this list and choose best ideas. If you have a big list of ideas, you'll definitely find something worth building. You can't just seat and generate ideas, you'll find them accidentally.