Affinity photo is quiet good, I bought it recently as not being a pro can’t justify CC costs. Affinity photo does most of what PS can do. Currently on sale for 30% off , when I bought it was full price 2 weeks back but I sent them an email to there refund team and was credited back right away. But even at full price it’s a bargain. Paintshop pro is another great alternative. But on research in dpreview forums etc Afinity has a good following plus lots of tutorials.
https://affinity.serif.com/en-gb/photo/desktop/
+1 for Nebulosity