Formation 3-4-1-2

[Corona]

if you want to keep that formation i would do it like this:

your center defense is weak with only one dc. so if someone uses 2 or 3 central strikers you have a problem. you can recover it a bit to put blue arrows on one or 2 of your mc's but then best thing to do is probably use a dmc and get a diamond. your midfield is very strong. and to get some versitality in your formation you could put some red arrows on ml/mr and attack through tthe flanks. otherwise just attack trough the middle and dont use red arrows on your mr/ml but on your amc. you have an attacking formation so i would definitly use attacking style, press whole field. use zonal marking and no counter attack. optionally you can use offside trap if you have fast defenders.

btw: if someone uses for example 2 strikers and aml/amr you are in big trouble. you should put blue arrows on your mr/ml then. but i wouldnt recoomend this formation if someone play like that.