Qubes as a way to avoid being tracked across multiple devices on YouTube and other sites?

I've got a family member who is getting into digital privacy. The family member has noticed that if you watch a video on YouTube with a privacy focused browser like Brave and then go to another device, you'll get recommendations for videos on the same subject.

Things we've tried so far:

* Using browsers like Brave with cookies disabled * Browsing with TOR * Browsing using a VPN * All browsing is done with anti-fingerprint extensions installed. * Watching videos only with software like FreeTube or Invidious

I've been Linux user for a while, since the late 90's. I've been looking into QubeOS. Would that help with situations like this?

To clarify (I've posted on other subreddits and they all seemed to miss this) the issue is NOT getting recommendations. The issue is getting recommendations that make it VERY obvious that the browsing and in particular watching activity was being tracked somehow because some of the recommendations were not trending topics but very niche and specific topics my family member had recently watched videos about on another device.

Other somewhat related notes/questions:

* We've got a Google Home WiFi access point - the model without any speakers or mics. Could that be tracking our habits across any Google-owned products?