Seems like Piped and Invidious are both on their last legs. Public instances on both services are pretty iffy, they go down fairly often now. Freetube works well on desktop but no real way to sync subscriptions and watch history to a phone. Self-hosting Piped/Invidious might be the solution but I don’t know if it’s worth the upkeep when YouTube is actively fighting against it.
TubeSync sounds like a good alternative for what I’m looking for. I’ve already got a Jellyfin server running so this will be perfect. Here’s a link for those interested TubeSync