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Couple of things have changed. YT have reduced payout on CPMs to creators but they've also reduced the cap on ads per video minutage and relaxed some previous restrictions on the number of skippable vs. non-skippable videos.
Advertisers have also seen a trend of better brand recognition for some 10-20 sec non-skippable videos over the 5 second true view vids so are shifting towards them. This is also helped by a reluctance to spend on shorter cuts than TV due to covid / budget cuts etc.
TLDR: Lots of things mean more ads.
Has something recently changed on youtube? I seem to be getting a lot of adverts recently, whereas I used to get very few.