Spam solves. The only way you’ll be able to improve is if you know what you are doing inefficiently/wrong. I would suggest making a new main session (if you have a main session), and then doing the solves on there. That way you can track your improvement from when you “restarted” cubing, rather than comparing yourself to your old averages. This makes it so that you actually feel a sense of “I’m improving” rather than “I’m not as fast as I used to be”. When you’ve done a few hundred solves or so, you can start learning things you don’t know, like full PLL, full OLL, more F2L algs, etc. As for 3OH, I found that getting better at 3x3 also improves 3OH, so I would suggest mainly practicing 3x3, since 3x3 skills carry on to 3OH.
Also when you get back into it, don’t forget that we still have that DM from like months ago about the critique (you “promised” you’d send the video and scrams lol)