Daily writing in public is an iterative cycle. You start with an idea, you outline a post, do some research, elaborate, edit, and publish. The process can then generate new ideas and start itself all over again.
I already wrote several times about the importance of practicing daily and keeping your writing streak alive, but let me tell you a secret: it doesn't mean you have to go through the whole cycle every day.
Writing something every day is important to keep your observational skills sharp and to improve at your craft, and your ability to deliver on a daily basis is as important as your capacity to write daily.
On the other hand - ideating, outlining, editing, and planning your publications can be batched together once a week. On Sunday for example, when you have a block of uninterrupted time. It seriously increases your writing productivity to prepare posts in this fashion beforehand. More importantly, it prevents you from falling off the wagon when a day gets out of hand.
I get it, you probably think you don't have time to write every day. But this is no excuse not to prepare something to publish beforehand. Schedule in advance, write whenever you have time, and note down your ideas whenever they pop up.