My subscription feed is filled with things that are completely irrelevant because it doesn't adapt to my interests. I guess I could prune my subscriptions but why would I when the home screen works so much better? Also if you only watch people you're already subscribed to it will be hard to find new things. I don't know what makes you say the home screen is "just ads" because that's definitely not true
It's just ads because YouTube serves you think most clickbaity thing that will keep your eyeballs on screen (for the ads). Homepage doesn't care about discovery at all that's just a side effect.
I think maybe you should stop subscribing to channels you don't like?