I know this sounds crazy but I would honestly touch the mutagen.
All you need to do is just be in contact with the thing you want to mutate your dna with. I choose a tiger. I really wish I could. Then I would befriend the ninja turtles and splinter. I like tigers. I really do love this show, it’s on of my favorite childhood shows along with wild krats. I’m currently rewatching it and I’m on the second season.