Let's be honest, this FM is characterised by 3 things:
- double DMs on a support role.
- pressing high
- goals from central players (ST and AMC).
Other approaches are possible, but these 3 things are objectively stronger than their alternatives in FM24.
By playing a 4-3-3 (always my preferred system) rather than a 4231, you're playing directly against the meta. You won't be able to:
- get enough extra goals from the inside forwards to justify not using an AMC. (They're simply not coded to cut in diagonally enough without the ball, and won't latch on to many diagonal through balls in behind);
- get as much from the 433 as a high pressing system compared to the 4231;
- and finally you'll forgo the double DMs on support duty which dominate in FM24.
Overall you're choosing to run against the wind by trying it.
It's possible to succeed with it but ultimately you're fighting against what works well in this.