Should I prioritize reverse dieting to build up my metabolism or getting lean slowly to have a better body weight?

This is tough to answer without more background info, but if reverse dieting is needed, I suggest starting there. If you are reverse dieting, it sounds like you are in quite a calorie deficit, which will still allow you to drop weight or body fat. You can still lose weight while on a reverse diet - some people find they lose weight faster once the reverse diet starts.