Why take the gate control

He should buy or copy as many books as he can

He should improve his mind space and make a clone spell like shadow clones to keep reading and learning all of the books he has

He should buy one of every plant he can on the market for both the normal and magical sides and animals too.

He should make Baymax to improve the health care system of the world

He should study the ROR and fuse it with his Dojo

He should catch some Sea kings and put them in the seas around Pokemon island for his people and Pokemon to eat

He should turn his personal lab into a pocket dimension with the arena placed in it so that others can use it to. And he should not do whatever it is he’s going to do with souls

Fuse his magic with technology to make An armor

He should make an Iron man armor fusion with the spartan halo armor as his armor and make some Zords

He should have Cortana Learn and improve his systems with all the knowledge of the two worlds he’s been to and Halo plus every other world he goes to later

He should make a place like Zatannas mansion but bigger, better, and more fortified with magic from three different worlds

He should learn a Occalmancy too and have Cortana copy and all three books into her database to increase her knowledge

Cortana should use the towers to gain all the knowledge Ruby world has of technology to improve her abilities and his knowledge after he has returned so he can improve his companies productivity

He should fuse the iron man armor with the Spartan armor from Halo to make a better armor for himself

He should give Cortana all the knowledge he has form Abelodi

He should heal Carols mind damage to when they meet her

He should just create technology that can reverse and fix environmental problems and damage

Turn that area into a village for them with a farm and ranch

He should be wearing them on his side or leg