I'm not sure who else there is, that would be a realistic target. When you look at our attackers there are only Mbappe, Ronaldo, Messi, Neymar, Hazard, Mané and maybe Rashford that are good enough, or better in the case of the first four names - but clearly none of those are available at pretty much any price.
Who else would improve our first team enough to help us make a better title challenge next season? I can only think of Sancho and maybe Haaland?
No point signing more squad fillers like Oyazarbal or other slow, average at best players. We have to improve.