Thank you for your interest! Unfortunately, we will have no mentors this round for the OCaml community. I think it is quite possible we will be back for the December round all being well. I encourage any prospect mentors to share any details here if they are tentatively considering mentoring in the next round.
As one of the maintainers for ocaml-tiff and ppxlib I can say that it is unlikely either project will appear in the next round, though I am happy to help you tackle any of the open issues on those projects.
Although we cannot support applicants like we usually do (financially via Outreachy, mentoring, etc.) all of these projects remain available and are likely eager for contributors. Contributions don’t always have to be tackling issues, even just using the tool (for example, building your own YOCaml-powered website!) and providing feedback/bugs is also very useful.
P.S.
I am no Windows developer, but do note the DkML distribution was recently sunset: [ANN] Sunsetting of DkML distribution