Zimone High Power Bracket 3 Help

Hey guys, is there any way to make my deck stronger while staying under 100€ budget? https://moxfield.com/decks/sUqHYYe_yUGc6dVLVhStSQ

It feels like there is not much left to do except maybe add a Brainstorm and a Brainsurge or something like that. But for what would I cut them?

Any advice is highly appreciated