I was playing around with some features, and I think I messed up with the “Smooth” tool. I can’t push/pull any surfaces, and my lines are wonky. Can this be undone?
They are two different things, your lines look wonky because you have chosen a ‘Sketchy Edge’ style in Styles.
Softening edges will make faces blend together and pushpull will only work on a single face. Use the Soften/Smooth Tray to unsmooth.
Attaching your model would help us give you a more specific answer.