For starters:
State of the art hitting lab - LSU has the best hitting lab in the country, so much so MLB players that aren't even affiliated go there to train in the offseason.
State of the art pitching lab - See above but sub Wake Forrest for LSU
Make Texas baseball facilities the premier place for training for Texas players, MLB players, etc.
Home locker room complete renovation
Player rec hall, trophy room, etc for strictly baseball for recruiting/player ammentities.
Player weight training facility, this could be part of the just mentioned rec hall.
More seating in the outfields for students and create a student oasis of sorts to drive engagement and fun atmosphere for them. Create fun things for them to do pregame instead of just showing up sitting there and cheering(See how much student seating and gameday changes for students has improved our student crowd at DKR) and just for the general fan as well. Make Texas baseball an event, not just a game(Insert old baseball take from boomer here about how it should be about the game).Obviously the outfield seating issue may be that is out of our control because roads but you can do the same down either of the lines, most likely the visitor side.
If I'm not mistaken the last major upgrade to Disch was in 2008, right? That's forever in the facility arms race.