Instead of blocking channels, trying going through your watch history and deleting anything you've watched in the past that's similar to those. YouTube heavily leans on your history for recommendations, so if it's recommending those, it's because you've watched related stuff.
My YouTube feed never recommends any of that garbage.
Bonus points if said 'tuber is pointing at something with their hand and also a red arrow and/or circle which id also blurred out.
Intolerable.