You can try Automate instead of Tasker, for automation in general. IMO Tasker’s interface and workflow leave much to be desired. However, Automate is also paid via Google Play, so the same issue might be present. You can ask in their subreddit.

But, I’ve never seen anything in Automate allowing to stop charging.

Loop Habit Tracker is pretty good for this. In particular, it allows you to schedule stuff like ‘twice a month’, or even ‘run 10 km a week’ or somesuch. The app shows the whole list, but marks which tasks are done and which aren’t yet. Plus there are notifications and widgets, but I haven’t used the latter.

Best part is that it’s open-source and requires nearly zero permissions. OTOH the data isn’t synced anywhere.