A good rider is also a good mechanic. If you can't maintain your bike, how do you what it's doing right or wrong? This is motocross 101. Mellenials...it isn't handed to you.
Ron505 said it correctly about the undeniable factors of each motor!
Either way you go it'll be fun. 4 strokes are cool but 2 strokes are a lot of fun. I think either way each of them presents their weaknesses and strengths. I've seen sloppy out of shape guys shred on a 2 stroke. I've seen guys in great shape suck on a 4 stroke. Just pick one and go have fun