I really like Carlo's tactical pragmatism but think 3/4/1/2 should be our default formation with our current personnel.
I'd have :
Pickford ( who I'd like to replace)
Holgate
Keane
Godfrey
Coleman ( to be replaced )
Allan
Doucoure
Digne
James
DCL
Richarlison.
For me that's a really well balanced team although I acknowledge that 3 a the back had been hit or miss this season.
In terms of summer recruitment we need as starters a RWB and GK.
Branthwite and Mina give decent back up at centre back with even Coleman and Digne able to play RCB and LCB in an emergency.
Coleman has been a fantastic player for us but should be replaced whether we play 4 or 3 at the back. He is fine as back up.
Digne is the perfect LWB. Is Nkounkou acceptable back up?
We need cover in midfield. Davies has improved enormously but Gomes isnt consistent enough for me. Gbamin....who knows? I'd like to see us for for a really dominating player as a back up for Doucoure but who can give us legs , carry the ball and pass.
Sigurdsson is unlikely to have many suitors and I'd be happy to retain him as back up to James but only in the no10 role .
DCL and Richarlison have the potential to be an outstanding partnership and hurt any team. I don't think it will happen but I'd be very happy to see Kean return and be rotated in a front 2. If we did that we would need to sign a Calvert Lewin type back up. If Kean goes then clearly it brings in a big fee and requires a replacement.
I'd like to see us sell / release Pickford , Kenny , Delph , Iwobi, Bernard.
I will leave it to football intelligentsia on here as to who the replacements would be.