23 years old Fran García, LB, currently at Rayo, will return in July via buy back option. He'll most likely be an alternate starter. You'll have Mendy, Camavinga, García for one season, which is good enough; as stands now, Davies will be targeted in 2024, so no huge LB next summer. On top of that, Leipzig CB Gvardiol is said to be high on the list and can either play LB if needed or shove Alaba there, again, if needed.
On the right side, things are different in that Vázquez and Ordiozola will go into their last season at Madrid, if at all. If they are moved on, you'll have Carvajal for one more season and quite a gap behind him. But, 18 years old Vinícius Tobias, RB, currently in Castilla on loan from Donetsk, may end up staying in Madrid though. He's a very nice prospect, ready for a loan to a mid tier team as of right now, or more by the end of the season. That remains to be seen, but he's doing very fine this season.
So, I think the money won't go into a RB, but will go into a B2B profile with good aerial skills and consistent forward/line-breaking passes, well, Bellingham with name, and a CF to replace Benzema, either immediately or over the span of the season. The backs, I'd say, will be sorted after that, with Davies (and possibly Hakimi a year after) as targets when their contracts reach the final year, even if that means one more year with Odriozola.