Oof, Ray. Your list daunts me. Best of luck with it.
Making steady progress on my dragon WIP. Can't wait for the end -- it will be epic! (i hope)
1) some of the ideas and bits of writing go back to 1989, 1992, 1996 or 2012.
2) Look at Started and last edit dates. Not so much activity in last couple of years
3) I was made redundant and eventually was writing fiction full time. Now mortgage is paid off & I'm on pension.
4) Using Word processing since before the PC existed.
5) Years of semi-fiction writing: Project proposals
6) Electronic Design, Programming, writing manuals, writing training material, giving courses etc over 30 years.
7) First SF story was at school about accidental discovery of AI on a spaceship, a very long time ago. Big non-fiction MSS on Amstrad PCW using Wordstar on origin and convergence of Communication and Computers in 1986. I, erm, misplaced that, so I'm careful about backups. The tech work experience helps me remember that and gives me the tools. One off site back-up is a server in concrete solar powered shed, with also its own UPS at the end of a 1Gbps Cat5 cable. Some of our cables are Cat5 put in in 1998 and then mostly 10 Mbps!
Vital stuff in the house & freezers etc can run about 20 hrs with no daylight charging or grid.
But I never did get round to learning to type properly.
I do think most famous people are so partly from work, partly from talent and a lot of luck. I know great musicians that have never made the charts and will never make the cover of Rolling Stone. She who shall not be named got a lucky contract terms and media exposure. There are plenty of better writers, series, etc that don't make enough to live on. Fortunately I don't need to make money at it. Most published writers would starve in a month if the books was their only support. Even trad published.