I regret not doing this sooner.
By doing just these two things I managed to find awesome people who are interested in the same subjects as I am (fintech, optimal decision making and personal Knowledge systems).
If there's something holding you back from just sharing what you're doing and what you find interesting, don't wait until your product is finished to share how excited you are about building it.
Share your pains along the way, even if the project doesn't end up working out, you'll have helped tons along the way with similar errors.
My biggest two posts are "How I Use Obsidian to organize my life and Writing" and "Some Errors I’ve Found Developing With KMM" which were two things I started doing for a project that didn't work out in the end.
Don't be afraid to share what excites you.