I install my keys on 5 Yubikeys and then encrypt a copy of the private key so that it can only be decrypted with one of the Yubikeys. I store the encrypted bundle on Google drive and I’ve spread out the Yubikeys a little geographically by sending them to friends who I trust (PIN is still required to use the Yubikey so there’s still a layer of security). I also keep one of them in a safe at my house just in case.

I do feel like I may have gone a little overboard but maybe something similar could work for you!

I found this article interesting and relevant: https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html