PySide vs. .NET WinForms for a Desktop GUI App in 2023?

Hello Folks, For an upcoming side project - a Desktop GUI app, open source, Apache 2.0 licensed, I'm slightly confused regarding what technology to use. Skills wise, C#/WinForms should be my natural choice as that was the primary technology I had worked on before losing employment at Tech Mahindra few years back and getting into freelancing. But post my freelance experience, I taught myself things like open source and Python as it came with the territory, and now PySide2 is also a running candidate in this race. The goal here is to be as much ubiquitous as possible - that my app should be easy to just "download, extract and run" by as many people as possible. A couple decades ago, a .NET GUI library targeting Microsoft Windows platform would have been the clear choice here as most people used Windows OS and targeting that platform meant being ubiquitous. But over the last few years, I've observed that Windows OS has been continuously losing its market share to Linux Distros and Mac OSX, mostly due to some incorrect decisions and strategic blunders by the former than some ground breaking or revolutionary innovation on part of the latter. This means .NET or WinForms is no longer the ideal choice today if you want to be cross-platform and ubiquitous. This lead my research to some other toolkits like the Java Swing library, for example. It's old but classic, not a bad choice at all in this case, platform independence is Java's biggest selling point. However, the app I'm making is non-trivial and slightly performance intensive, and Swing GUIs are known to be sluggish on PCs unless you ensure a good supply of RAM by tweaking the JVM settings. I'm also not very experienced in Java to be able to handle those situations in case they arise. I also considered Lazarus IDE/Object Pascal, it is also not a bad choice. It is open source, used as the primary course language across many Universities in Europe and most importantly, still maintained and developed. But guess I will have to teach myself a whole new paradigm along with a programming language in case I go this route. Finally, Python is something I've almost settled on for this project. It's a language that I'm very fond of and it has helped me survive through the tough times in the freelance market. It also has a vibrant ecosystem and rich repository of user contributed packages like PyPI. Now, I've worked on the default Tkinter library in past but somehow felt that it's quite limited in terms of making the GUI more flexible and "tweakable", especially a non-trivial one having several container widgets, syntax editors, menus and drop-downs, trees and list views, etc. PySide2 is, from what I understand, a better choice in this regard as it is comprehensive and based on the time-tested Qt interface. It is not only very easy to code and maintain but also very easy to port across various platforms. What do you think? In which direction should I go here?