Building a bridge to a different path

Trying to switch paths after being well into my career is a difficult thing and I'm my own biggest obstacle. I am constantly fighting with myself mentally. There are so many questions that I get hung up on as I think about this. They go something like this.
"How am I going to pay the bills as a writer? Will this make enough money for our dreams? How do I replace what I'm already making if I want to be a full time author?"
Then I add in the habits that I've formed over the years. I've built the habit of saying, "One day I want to write a book," instead of showing up to write with the belief that the book will come. I finish my day at work, then decide I just want to veg instead of write. After all, there's no deadline. I can start tomorrow.
I'm trying to accept that I do not know how the future will play out around this. Will my writing ever pay enough to live on? I have no clue, but I'm certain that it never will if I never start. If I never pay my dues and do the work.
Last night I watched this video by Steven Bartlett on the Behind the Diary Youtube channel. (The link skips to the challenge he made.) He said he was shouting at everyone who was watching the video to "make some f*****g content." He then challenged me (because I might as well personalize it) to make content every day for 90 days. Not because 90 days will magically make me a success, but because I'll have built the proof for myself that I can do this and will have gotten through some of the mistakes I will inevitably make.
Who knows how this will go? Not me, that's for certain. But off we go.
Book Status
No real update here. I've been grappling with an aspect of a prison break, but really I've been trying to finish a master's degree capstone. One last class. Two more papers. Then I'm free from something I started last November. My goal is to have the degree done by October 10.🤞