Hi,
Since we had troubles getting GSoC students and project ideas in the past year I'd like to bring up a controversial suggestion: Talk to the projects that popped up around Wine like PlayOnLinux, Lutris, DXVK if they have GSoC-compatible ideas and host them as a Wine GSoC project.
Ideally those projects would be something that reduces friction between upstream Wine and other projects. E.g. on FOSDEM I talked with Josh Ashton and he mentioned d3d behaviors that some games depend on for which we don't have tests and that sometimes work in wined3d by accident or don't work. Syncing those lessons by writing and upstreaming proper Wine tests would be a valuable thing for everyone.
I don't know enough about PlayOnLinux or Lutris to suggest anything outright, but I still think it's worth asking them.
Cheers, Stefan