Where do you get your sets?

I’m a high school male swimmer that’s not on a club team at the moment due to the fact that the nearest one is nearly 45 minutes away from my house. I’ve become a member at the nearest indoor pool though so that I can start practicing again. I’m a fairly capable swimmer (23.5s 50fr). This means that I’ll be my own coach which is fine because my technique is fairly solid. I don’t like making my own sets though because if I make it then I feel like I can change it during the swim which isn’t ideal. I’m looking for some interesting sets that would gradually challenge me as I swim 3x a week. Any recommendations for resources I could use? So far the only thing I’ve found is the swim.com app which looks good, but isn’t very structured from week to week and instead provide options of user created individual sets. Thanks in advance for any help!!!