You could join a book club that meets over zoom. Very cheap if you can get the books from your library
Some good YouTube channels for exercise are: Madfit, Chloe ting, yoga with Adrienne, yoga with Kassandra.
Jigsaw puzzles - charity shops have them at great prices
Study something that you could set up as a side hustle or to improve your promotion prospects.
Grow some plants. Tomatoes and strawberries do well in pots.
Cooking - I love to cook and try to do one new recipe a week. So as well as cooking I spend a lot of time browsing recipes.
There are lots of painting tutorials online that only require you to have the primary colours, black and white as they teach you to mix the colours.
Cross stitching. Again, you may be able to pick up a complete kit in a charity shop.
Creative writing or just journaling