I lost 90% from May to December. December update gave me 3x the clicks I was getting, and now resulting in having 50% reduction since the first 2020 update.
Mind you, I haven't changed a damn thing since December 2019. In fact, with losing 90% + covid killing my other business = left me extremely depressed and I stopped visiting my site for a couple months, so I for sure didn't touch anything to try to improve these stats.