Maybe try something like jigsaw puzzles, word puzzles etc...things like these help work your mind. it worked for me when I had issues. you can find tons of games on line and even cheap puzzle books in dollar stores.

something I did as well was make myself write using my weak hand. try copying a paragraph using your other hand..and doing it legibly. it will take forever at first but soon you'll be able to do it with skill and precision.

the brain is a muscle. if it gets weak, you do physical therapy and work it back I nto functional fitness.