I started out making this guy but accidentally got rid of all my lower subdivision levels. I’d like to keep going, but I’m afraid I won’t be able to work with the uv maps to paint this guy. Can I fix this?
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I started out making this guy but accidentally got rid of all my lower subdivision levels. I’d like to keep going, but I’m afraid I won’t be able to work with the uv maps to paint this guy. Can I fix this?

Yes. Just duplicate him, use Zremesher to build a new low poly, then project him onto that (with however many levels of division you want). A lot of people sculpt, and paint for that matter before they think about the low poly version.
Thank you!
If you haven’t changed your topology you can use the “Reconstruct Subdiv” button in the Tool>Geometry section.