Blackmagic Davinci Resolve is pay-once-for-life, works on linux, and is better than Premiere.
Even if it were only equally good, not being subscriptionware means I'm a loyal user.
The license isn't expensive for what you get. I bought the USB dongles so I can easily transfer it between computers and also completely block Resolve from accessing the network via Little Snitch.
I can also heartily endorse the Speed Deck control surface, which is way less than $300 and also comes with a pro license.
When I come across files that DaVinci Resolve won’t open, I convert them to a format that DaVinci Resolve likes by first using the open source command-line utility ffmpeg.
I still don't have a Lightroom replacement, so I just crack it.
Darktable has its fans as well, but I haven't tried recent versions.