30 second unskipple adverts are coming to you tube in a push for users to buy subscriptions.
First two are well known and simple to use.

Those with Android devices can use > https://revanced.net/

Those using windows > https://ublockorigin.com/

Lan blockers>
Pie Hole can be used within your local lan using a Raspberry Pi> https://pi-hole.net/

More difficult but an internal lan global adblocker for those with an Asus router is the "Diversion" plugin. Merlin CFW is also required.
Asus CFW> https://www.asuswrt-merlin.net/
Diversion plugin > https://diversion.ch/diversion/diversion.html