I'm so sorry Bella, I have been there, I couldn't take care of my horses after my accident. Hardest thing I've ever done. Is there any possibility to keep your favorite? I messed up badly when I rehomed two of mine and I'll regret it forever.
Hopefully everything will sort out, it's a tough market like you said so please be super careful and investigate the potential new owners to the fullest of your ability and GET REFERENCES. Have you looked at free leasing or donating your gelding to a therapeutic riding facility?