Digitally remastering Old Masters to restore degraded colours?

I know this is an old topic but I’m looking for some guidance. I have a 10 year old acrylic painting that I made as a gift for my twin brother’s wedding but I didn’t varnish it/know how to preserve it properly as I was new to painting (and probably also over diluted the paints, or added too many layers etc). I want to see if I can restore it digitally for a print for his anniversary. Do you know any apps or services that I could use now that AI is even more prevalent now I feel like this should be a thing. The free apps/tools online are still pretty bad however…