Here is every single way I can think of to block YouTube ads:
uBlock Origin + Firefox
NewPipe on Android
Libretube on Android
uYou+ on iOS
FreeTube on *NIX and Windows
yt-dlp + mpv
YouTube Revanced
Invidious self hosting
Piped self hosting
And finally, last and definitely least
YouTube Premium
Donate to the creators who make content. Google does not deserve a penny of your hard earned money.