For me it's:

1) Fitness: starting a weight loss diet and lifting/running as my body allows (I've got some minor injuries slowing me down).

2) Finances: trying to find a more fulfilling and rewarding career path to commit to. Making a plan to get there. Hopefully going to start studying towards it once I've decided.

3) Mental Health: trying to develop a consistent sleep schedule. Limiting my social media & Reddit time. Trying to talk to myself more positively, create more confidence. Trying to focus more with my wfh job.

4) Social Skills: haven't done much on this yet, but I think I'll read How To Win Friends & Influence People and Models at some point. Lots of time to learn theory.

I really think this quarantine is a prime opportunity for self improvement. It's putting a pause on the constant busyness of life, and letting us prioritize what truly matters. It's a rare opportunity to reinvent yourself!