[Bancakes]

Ublock Origin for HTML/CSS/JS ads.

SponsorBlock to auto-skip in-video ads.

PiHole for network-wide blocking. Or just add Energized hosts to your router's hosts file, I like Ultimate.

Or set adguard DNS in your router/smartphone/PC.

They really do work.

[spiderpug]

I have AdGuard as DNS in my home network and my FireTV's YouTube still shows ads. My phones too. Any pointers?

[Bancakes]

It's a partial solution, sadly... Try youtube vanced or similar front-end changing apps.