I only learned two things in 2021:
1. When you actually have the time to binge them you will notice that most new netflix/disney/... series are pretty boring and/or stupid.
2. As much as I hate admitting it, I actually miss talking to other people IRL. My previous plan to make some money and then move to a cabin in the woods for the rest of my life is probably a bad idea.
Edit: although today's post about Japanese game dev not leaving the for 10 years sounds tempting.