I have tried countless linux distros, none of them satisfied my security needs. Deksktop OSs are all flawed by design. I can say that with probably more confidence than a dumbass like me should have. I will link a bunch of websites where I have found useful information. Do your own research. My personal conclusion is that Standard Linux distros are a big nono, Immutable ones are better. Maybe try secureblue. But it also sucks, because it's always about tradeoffs. I am still searching for what I want, currently dual booting into kionite with hardedining applied and windows as my primary. I want to leave windows at some point completely, but I can't find anything like equalizer APO for linux. Qubes OS is a very niche thing and imo a waste of time for most people. I'm sorry if I offend anyone with my incoherrent ramblings, but I wrote this in one go on my phone without stopping for a second except for adding the links. I wish you more luck than I have had until this point researching this.
Some useful links:
https://madaidans-insecurities.github.io/index.html
https://www.qubes-os.org/intro/
https://privsec.dev/
https://seclists.org/dailydave/2010/q3/29
I recmmend reading every link possible on all the linked sites that refrences something. And of course, check other sources aswell. This is very basic information, that as I already mentioned, was sharted out by a dumbass in one go.