I find a very simple, yet rewarding exercise is “look at kanji for a few seconds, then look away and write it.” Don’t worry about meanings or readings. Just focus on seeing and remembering the radicals and their strokes. After doing this for a while, your brain will get a lot better at storing information about kanji.
The other day I walked past a sushi place and saw a kanji I had never seen before. Because I had practiced breaking down kanji into radicals and seeing the strokes, I was able to remember it until I got home several hours later. I looked it up and found out it was the kanji for samurai, 侍.
Being able to remember it was a great feeling, and little accomplishments like this keep you motivated.