IMO it's not about how much, or even about how many we bring in, it's about what we do with it. I'd like us to bring in more depth in centre midfield, specifically to make us less reliant on Xhaka, and up front, to make us less reliant on Brobbey (assuming Isidor leaves).
I'd like to see us improve how we get more support to Brobbey (but that might be about changes to the way we play, to get more out of the likes of Talbi, Adingra, Rigg, and Diarra, rather than new signings as such).
I think we have to grow used to the idea that we may be selling 1 or 2 players each summer if we can sell when the time is right - I have a feeling we may sell Sadiki rather than Roefs this summer.