I think when it comes to forums and helping people it's more a question of confidence in your abilities than the actual amount of them
So how your last project went has a large impact. If you get stuck a lot you probably won't feel like you should give others insight, even if you probably are well versed in many aspects.
One thing that makes helping people difficult is that also often questions are too game/system specific. Personally I'd only answer questions of a general nature or those specific to GBA since that's what I have experience with, but since that experience hasn't been tapped in many years I'm nowadays even hesitent to do that. Though I still know enough to know where to look to refresh myself on a topic.
One important aspect to being "ready" to help others is of course understanding what you are doing
I mean really understanding why the steps you are doing are being done and not just because a tutorial told you so. For example many people just don't grasp the connection between the font and relative searching. They use relative search as a tool because they were told to, but don't get how the search correlates to offsets to the glyphs in the font. Thus they make mistakes like mixing upper and lower case letters in a search. If you realize you understand how something works then I don't see why you wouldn't be able to help others with it.
Having a lot of stuff released should not be a criteria if that was something you were thinking about. Most users won't recognize your name even if you did release a lot (unless you are Gideon