Affinity Photo is good, an alternative to Photoshop rather than LR, will cost you £67.99 for a perpetual licence at the moment. Couple of times a year you get a much cheaper deal. You get free updates until they make a new version. When I eventually upgraded to AP2 I got Designer and Publisher thrown in for a similar price!
I use Capture One Pro rather than LR; it's very good, but licensing has been a bit controversial in recent years. I have a perpetual licence; I don't get any free upgrades now, and haven't had a paid upgrade since some time in 2021. This is OK for me as most of my cameras haven't changed since last century! I may well pay for one more (quite expensive) upgrade to sort out an issue I have with processing black and white scans, but if/when C1Pro becomes more untenable I'll definitely be looking much more closely at darktable.