Other than adblockers there's also different frontends, like
An alternative privacy-friendly YouTube frontend which is efficient by design.
piped.video
which also supports automatically skipping the sponsor-segments in videos and stuff like that. Some times the main site can be a bit overloaded, but you can switch to different instances in the preferences.
Just for fun I loaded the same video with adblockers on youtube and on piped. The amount of data transferred before even starting the video was 17 vs 4 MB. Hightly noticeable when browsing with a less then stellar connection.