Lineup advice after selling my whole team – who are must-have cards right now?

About a month and a half ago I sold my entire Ultimate Team and just started rebuilding. This is what I’ve picked up so far.

Looking for suggestions on must-have cards right now or players that play way above their overall.

On defense I run a lot of nickel zone, so players that really shine in that scheme would be great.

On offense I mostly run gun formations, so I’m also open to any recommendations that fit that style.

Also wondering:
• Are there any challenges or solos worth grinding right now?
• Any budget beasts I should grab?

Appreciate any advice 🙏
(have about 1.1 mill rn)