A solid choice! The 4-2-3-1 gives you a strong base defensively with the two holding midfielders, while still offering plenty of attacking width and flexibility. To solidify the back while also becoming more dangerous going forward, here are a few tweaks you could consider:

Full-backs Push Higher: If your full-backs are getting forward when possible, they can provide width and stretch the opposition, but they also need to be disciplined defensively. You could have your wingers drop back slightly to cover when the full-backs push up.

Holding Midfielders' Roles: One of the two holding midfielders could act as more of a "ball distributor" while the other stays deeper, offering cover. This can help you build from the back but still have someone who can break up attacks.

Attacking Midfielder’s Positioning: The central attacking midfielder (CAM) should be a link between midfield and attack—positioning them in pockets of space, between the opposition's lines, can make a big difference. You could also have them drift wide to support the wingers.

Counter-Attacking: If you’re playing against teams that leave space in behind, counter-attacking with pace could be deadly, especially with a lone striker. Having that CAM and wingers push quickly can catch teams off guard.

Pressing High: If you want more attacking intent, you could implement a higher press when you lose possession, making it hard for the opposition to play out from the back, and quickly regaining the ball in advanced positions.