Good question in the middle of summer and the ongoing pandemic.
1. Take a break. I did, I went fishing for a week. Caught 2 fish.
2. Take an online course. I took a class on teaching adults with the Francis Clarke Institute in New Jersey.
3. Sight-read for a week or two, exploring some new music. Musicnotes.com is a good place to start. First page is free, you can read off a tablet.
4. Read a book on learning the piano. You might enjoy Alan Rusbridger's book "play it again". He has some YouTube videos that support the book.