After a few thousand sweaters the next one is probably similar to one that you already made so I got bored and ended up burning out. That left me without desire to work on anything computer related, I bought a farm in Canada, moved there and ended up working on a windmill.
The websites I was running still contributed some income so I wasn't particularly worried about running dry.
Making the windmill required some tools, one of which was a computer controlled plasma cutter that I could not afford ready made and so I ended up cobbling it together. There was a little bit of software involved in that but nothing that occupied me for more than a few days.
The windmill design process involved rather more software but still it was peripheral to the rest of the work.
Then, in 2007 after returning back to NL I invested in a bunch of start-ups and at one of those a co-investor asked me if I wanted to do technical due diligence for a colleague, which turned out to be Endeit Capital, a well respected Dutch VC. One thing leading to another we are now working together for a decade+ and they've sent me lots of other customers as well so I'm nearly full time busy with this.
In the intermediate I also ran ww.com/camarades.com until enough money came in through the DD's that I no longer needed that income, I sold of all the assets in 2015.