Then don't make a blog per se. One alternative is to set up a personal site, not chronological, and post on pages set aside for specific subjects when you feel like it. Eventually you'll have written enough that you can rework the site into a book.
The Mastodon feed that you're already posting to is arguably enough of a chronological blog for most purposes.
Mastodon server for creative rationalists. Intended for light or technical discussion as opposed to strong debate.
Discouraged: Identity politics, religion, profanity, national events, X-rated discussion or materials. We might set up other servers for those things.
Encouraged: Creative Commons works, Minetest and other FOSS games, FOSS, writers, artists, recipes, rhymes, cat photos, G-rated webcomics.