I started writing for my own enjoyment in 1996, world building, character creating, short stories/histories and even started writing chapters with intent to be published traditionally (did a few rewrites too). All the same universe/setting.
In the start of 2009, the dark times started and I stopped writing. The worlds in my head kept living, I kept a number of traditional notebooks that I would write notes in when they got too loud. But actual, meaningful writing, none.
July, last year (2020), started up writing again and last night I just chewed through 500,000 words of all new content. (story/history/notes/and discarded story elements)
Improvements are VAST. Pre-2009 me had issues with dialogue, I had lots of great ideas and scenes but had issues with connecting them together over a book length. I had good world building, but...
Post-2020 me, it is sorted. I am happy with where I am now. My dialogue has improved massively and I have a firm picture of my stories and how to lay them down. Sure, there is always room for improvement. I need to sharpen and streamline some of the dialogue and, clean up my tenancies for superfluous description. The main thing is that my style is the way I want it now. (but there is always new ways of evolving!)
Only started posting my work up publicly just over a month ago.