Do I need more RAM or a new computer?

I have a 2021 Dell XPS 8940 with 16 GB memory and Intel i7-11700 processor. It has served me well. The only complaint I have is that when I use Corel Photo Paint, and when touching up large pictures it is very slow. Today I'm working with a picture that is 11"X15" at 1200 dpi, Everytime I do something it takes a while for the program to do it and release control back to me to do something else.

I have Task Manager up to try to get an idea of what is going on. The only thing is that I see is memory is at 50-70%. All others are very low, GPU 11%, CPU 5%.

My gut is telling me that I need more RAM. If that will speed up my computer that is a lot cheaper than a new one. And this one isn't that old.

Anyone have any experience to share that would help me?