I have a Grails app that was written using Grails 2.2.3 and which I only recently started moving to Grails 3.3.6. So I'll be continuing to work on that. And as part of the migration, I plan to clean up some architectural issues that I know consider bad decisions given the benefit of hindsight.

Depending on how fast that goes, and how much time I spend on that, I'll probably work on some Kaggle competitions or something else AI/ML related.