I find making a list helps a lot. Add to it whenever you have an idea for a post. Every so often spend some time brainstorming to add some more ideas.
When you don’t have an idea for the day, refer to the list.
I find the hardest part of writing every day is finding something to write about. Once I do, I’m usually in good shape.
I normally post 3-4 times a day. What I meant was that there are topics I'd like to talk about for the sake of those topics themselves and not because they serve as topics for posts.