I was just going to suggest this. I don't use Youtube logged in anymore or have any subscriptions, I instead subscribe to any I want to follow via RSS feeds. Any Youtube channel has its own native RSS feed, no third party service required. You could create different lists in your RSS client of choice for your different priorities.

It's pretty easy - I have the FeedBro chrome extension (there are many RSS clients, that is just one) and a typical youtube RSS entry for a channel lookes like

https://www.youtube.com/feeds/videos.xml?channel_id=UC2wdo5v...

that's the channel ID for Cutting Edge Engineering in QLD, Australia (mechanical engineering for life size mining | civil tonka toys)

This is exactly what I do as well. Instead of subscribing on YouTube, I just subscribe to the RSS feeds of channels I'm interested in and then use my feedreader to go through them channel by channel.