Keep Smalling he has his uses, sell Bailly while he still has some resale value imo.
Add Darmien, as well. So if we sell:
Rojo 15m
Jones 15m
Darmien 10m
Bailly 25m
=65m
And we add another 15m to those 65m and we get a better CB then all four of them in Maguire and we give a big talent the chance (Tuanzebe).
In:
Wan Bissaka 45m
Tuanzebe 0m
Maguire 80m
=125
So for a total of 60m we make a huge upgrade in our defense by adding a huge talent in RB position and someone that is already ready to start games for us, we also get a CB that is mostly needed and he has some qualities we really lack in our defense and we can also give, finally, Tuanzebe to fight for a spot.
Young - Smalling - Jones - Shaw
(Start of the last season backline)
VS
Wan Bissaka - Lindelöf - Maguire - Shaw
Get it done asap and move on to find 2 proper CMs and a RW and we are good to go and will be fighting for top 4.