Three things I can think of, off the top of my head.
1. Your ad blocker may be out of date. If you've liked it in the past, try looking for an update for it.
2. You can try a different ad blocker. There are many out there, a Google search will turn up many, I'd think.
3. Bite the bullet and subscribe to YouTube Premium. You'll still get ads from the video creators sponsors though.
For me, subscribing was worth the cost. It's about $11 or so, I think, per month. Since I don't have cable, that seems like a deal to me.