Not OP, but some users migrated from Qt to Slint and are happy with it. [https://slint.dev] (I'm one of the Slint developers.)

I work on equipment that can't open itself under LGPL3 rules. So I had to stop Qt use at 5.15, which went under maintenance support over 3 years ago.

I've switched to vanilla web technologies. Node, React, etc. It's painful and it sucks but hardware keeps getting faster and cheaper. I can find contractors easily and I don't need an increasingly expensive subscription^H^H^H^Hcontract with Qt to keep my developer seat hot. They tried multiple times to get me to abaondon my Qt5 license to switch to their new revenue model. I told them to fuck off.