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If this type of question is a good fit anywhere I suspect it's a better one here. Do you guys want it?
Should I contribute to a (kind of) abandoned project, or continue my own?
As for whether it is on-topic, then yes!
It's a little bit opinion based, but I believe that the question is just fine. All questions need some degree of opinion to arrive to an expert answer - an opinion that may come from experience or other credible sources.