I thought of something that would be very useful for my specific case.
Reminders should be somewhere you're already checking everyday out of habit. For some, this would be their physical calendar at home, for others (like me), their email accounts.
So I checked for tools that can send delayed emails and I found Boomerang for Gmail.
With this, I could send myself emails dated whenever I want to receive them, so I'll be able to give myself reminders via delayed emails.
@holroy's answer is spot-on, and I believe redundancy is key.
I just thought this would help other people as well.
I am not affiliated with Boomerang in any way.