After years of trying different things, I found something that works great for me, though I suspect you’ll have to try a few things until you find what is comfortable for you.
I publish my blog as a static site served by nginx on a $5 / node (which also hosts a dozen other things—I don’t get much traffic). Every once in a while I ssh in and run an apt upgrade but no updates to manage beyond that. I use https://getstatik.com/ to generate the site from markdown files. I’m surprised it hasn’t caught on more given how flexible it lets you be with defining how your site should work. The whole thing is stored on git and I can deploy with a push to my server remote.
That said if you want to focus on writing I would start with something as simple as ghost of medium to see if you’re actually as into writing as you think.