Your day is already a content calendar
Almost everyone who wants to start posting says the same thing in the first week: nothing interesting happens to me. Then they spend ten minutes talking about their day, and three ideas fall out.
The problem is rarely a lack of material. It's that the material doesn't look like content while you're living it. A bug you fixed, a customer who said something odd, a coffee where someone explained how they hire. None of it feels like it deserves an audience.
Why writing at 11am fails
The usual approach is to open TikTok, X or LinkedIn at a fixed time and try to write something. That asks you to be in a good mood, have an idea, and turn it into a post, all at once. Some days that works. Most days it doesn't, and the habit quietly breaks.
What you do every day is the root of your ideas. Talking about it is what puts a lens on it.
Split finding from writing
Journaling, or better, being interviewed about your day, separates the two jobs. First you just talk: what happened, what you worked on, what went well. Later you pick the moments that are worth a post. Neither step needs inspiration.
Do it for a week. You'll end up with more ideas than you can post, and the problem changes from "what do I write?" to "which of these first?"