I think we have seen after 2 seasons that Solanke is unlikely (not definitely) to be the answer. Lankshear - we will see if he shows enough in pre-season to maybe convince De Zerbi.
I think we need a mobile striker, so that would be someone like Nunez or type, and I think we need a poacher, which one might argue Richarlison is, but one who can offer a bit more on top.
I'm not saying it's easy to get the right striker (s), let alone to identify those who might be suitable, and there would be no point in selling Solanke without being pretty confident in any new signing, but we have to try and find strikers who the opposition fear, and who can justify that sense of trepidation.