I had a similar goal for 2020, to get 365 "activities". Definitely not all biking, I like to mix it up especially in the winter months with other stuff (hiking, running, skiing, Crossfit). Covid life made it easier than I thought and pretty much a necessity to keep my sanity, so I ended up with the best stats ever.
Between just biking and hiking, I logged over 600K of vert for the year. A lot of that was from peak bagging but also some hefty bike days (an Everest weekend for one). I still had some rest days, but also doubled up on other days with a bike ride and a gym/strength session to end up with about 350 activities. My real motivator was to keep exploring new places in my wide backyard, and to find escape from life, which turned out to be pretty good motivation, and I stuck with it even without having the goal of training for a race or event to keep me going. I was pretty proud of that, to just go out and do stuff because I could/wanted to and not driven to perform well in competition.
I'm thinking my goal for 2021 should be 1 million in vert but it's pretty dang lofty. I've gotten into backcountry skiing though, so I'm off to a good start. I can get in 5-6K vert pretty easily in a day with that!