You say you’re confident your videos are good, but maybe YouTube hasn’t recognized your content as good yet. Honestly, that’s how I see it.
My friend is also running 4 YouTube channels. The setup was carefully done from the start: each channel has its own profile on Hidemyacc with a dedicated proxy, and all were created with aged emails. So the setup wasn’t the issue at all. The content on all 4 channels is high quality, each focused on a different niche. But only 1 channel started getting traction, after uploading 10 videos, it began pulling in a few hundred views per video. The other 3 channels had almost no views, maybe 2–3 per video. All of them are long-form videos.
That’s why I think YouTube takes time and patience. You still have to wait for YouTube to categorize your content and start showing it to viewers who might like it. So keep pushing.