Forget about linearly and just focus on the athleticism. That'll stop you limiting yourself to anything that isn't linear.
Getting stronger won't hurt. Also faster. I haven't a clue about how to develop athleticism, and to be honest I'm really not even sure what it means.
But, if you just want to jump high and hit hard I guess doing a bunch of jumping and hitting things is a great place to start.
I guess getting stronger would help with that but it wouldn't be a main focus, and you could probably get away with limiting your strength work to squats, some kind of press and some kind of upper body pull. That'd leave you more room to work on jumping and hitting.