For example, if I say, "I'm really struggling in my relationship and would like some tips on how you make your relationship work, please share!" This is not a community thread, even though it's asking for input from the members of the community.

If you are on a forced Ignore with other members (e.g., a community support team member has directed you to place someone on your ignore list), you cannot start community threads. If you'd like to change that, you need to demonstrate that you will no longer have negative interactions with the member you are on a forced ignore with.