You can wait if you want. I would suggest signing up offering whatever you'd like! Many times in exchanges, people re-review requests to see if there's anything they're interested in towards the end of sign ups and edit their sign up accordingly. For now, I'd just suggest offering fandoms/ships that aren't exactly the same as what you're requesting.

If it's easier to filter requests using Ao3 AutoMagic, here's a link: https://autoao3app.firebaseapp.com/#/10ItemsOrLess_2025

If no one signed up requesting whatever you've offered, then I can reach out and see if there's anything else that can be worked out with anyone else that's unmatchable.