Are you a list maker and ticker offer
I am a huge proponent of making lists. Not just making them but organizing them in such a way that they create habits in me that were not there before. If this is you then Todoist is an amazing app you can sync across all your devices. https://todoist.com/
It allows you to create projects and tasks within those projects and schedule them just once or daily, weekly or monthly. It even allows you to set an alarm that will text you when a certain task or appointment is due as set by you down to the day and minute. I can set an appointment today to remind me 5 minutes before the Super Bowl, that the Super Bowl is going to be on and for Todoist to text me and let me know.
There is a premium version and I think they let you try that out for a while. It seems reasonable but when they turned mine off I didn't even notice the difference so the FREE version is plenty for what most people need. I think the premium version is for companies and such that want to sync schedules.
Anyway fantastic tool if you like this kind of stuff, I use if for everything from daily tasks to grocery store lists and more.