I've always believed in swombat's quote on HN[1]:
>There's no such thing as an original idea. Every idea worth having has been had thousands of times already.
No point in keeping ideas private. Keeping them public lets other people build things I would like to see, even if I may not have the resources (time/energy/motivation/expertise) to actually do it. It's a win for me either way.
I am also working on an idea management platform, because I like Sheets but it is also a limiting experience. I'm making automated question-answer with TTS and speech recognition, and hoping to make automatic pitch deck starter kits from question-answer sessions in app. Maybe it'll be a product some day.
Whenever I have a thought, I write it down. If I got that thought again, I might do a quick Google search and then give a rating to the idea. If I kept constantly thinking about it, I start researching it.
The research part might take maybe an hour a week. The other steps don't really take much time.
I find this to help with procrastination or losing focus.