There are plenty of alternatives for submitting videos, but YouTube has the content. The best option, IMO, is to consume YouTube videos in a way that doesn't track or monetize you, such as NewPipe (Android) and YouTube downloader.

Personally, I just don't watch YouTube much and prefer other entertainment sources. I read news on personal blogs, link aggregators (like HN), and newspaper sites, I have a streaming subscription, play video games, read books, etc. If I want to share a video with friends/family, I either email it or send a link to my NextCloud instance.

The hardest things for me to switch from has been Gmail and Google Docs, just because I have so much stuff already there.