I don't have a good ad blocker for you other than AdAway. It won't block YouTube ads on an unrooted phone, but it can on a rooted one. You can try in-browser mobile YouTube with Firefox + uBlock, but I would suggest switching away from the native YouTube app and getting NewPipe with SponsorBlock from F-Droid.
Alternatively, you can use the official YouTube site with Mull browser or Firefox with the ublock origin extension installed. But NewPipe offers a better experience since you can download videos etc.
Browser with extensions is great and all but Youtube Revanced still way better option it support gesture google account (that google can't track you) picture in picture and it's easier on your device's ram/cpu, for in app ads you can try Lucky Patcher to remove ads as long as the app is not using account to buy premium features LP should work on most app
I would usually suggest Newpipe but that's a little buggy rn so Libretube is probably your best bet, that even has sponsorblock aka it skips in video promotions from influencers too!
TrackerControl may work for this if you must use the stock app, newpipe is probably the best solution and finally, you can also use ad blocking dns and there may be VPN solutions as well.
Apps like AdAway and Blokada can work without root but in my experience they aren't reliable (they sometimes disconnect, create weird issues with DNS, etc), and when they do work battery life takes a noticeable hit.