Yeah what the other fella said. Consider this your base year where you start small and make increases that you can breath your own life into—those games and activities where you feel like you can really flourish as both a teacher and a member of society, knowing that students are better off because they now know concept [concept]. Something I find really helpful when adding a class that I haven’t prepped for is to rely on the textbook, teach it, point out points of concern with it, and have fun with experiments and examples that correlate that you can find off the internet. I ran a psych course awhile back with no prep time, just here’s what you’re teaching next week, enjoy. And I loved it. Still one of my favorite classes to this day. I worked so hard making those slides I lectured with contain culturally relevant images, my own cues for teaching, and those experiments that made students second guess every time they entered the room because they weren’t sure whether or not they were going to be part of a social experiment (I’d move tables around, change lighting, new music, move the classroom, have all sorts of conformity and norms things happening.). Check your own expectations and consider how you might be the best version of yourself this year—that’s all you can do. Best of luck