BTW #FuckYouTube and #FuckGoogle still.
Embeds of YouTube videos on other websites no longer work for me either.
I've set up a profile on an Invidious instance and moved my most popular videos to PeerTube.
I've installed an extension to redirect all YouTube links and embeds to Invidious so I can actually browse the web normally until YouTube finally bites the dust.
Any time I upload new content, it's going to PeerTube, and in the future I may embed the PeerTube videos on my website.