I can't recommend Daylio enough! It's an app that's constantly getting new features. It's very customizable! You can make goals and custom moods which both help me a lot. You can also set reminders to do goals or just to make a daily entry. And all your data is stored locally unless you want to backup up to drive. Which is pretty secure. I think I also read that the backup is encrypted but I could be wrong. You can also manually backup and encrypt it then.
I've been on quite a few. But I mostly was on lemmy.world but their reliability is low. So I switched to Lemmy.ca who federated with basically everyone. Unlike World. I was on .ml for a while too but left for some reason. I'm also on Beehaw, I like it over there but it'll never be my home instance mostly because you can't create communities and they don't federate with most of the ones I like. Being on Lemmy.ca allows me to interact with World and Beehaw from one account which is really nice. They also have really high up time!
I can't recommend Daylio enough! It's an app that's constantly getting new features. It's very customizable! You can make goals and custom moods which both help me a lot. You can also set reminders to do goals or just to make a daily entry. And all your data is stored locally unless you want to backup up to drive. Which is pretty secure. I think I also read that the backup is encrypted but I could be wrong. You can also manually backup and encrypt it then.