Lots to unpack here.
How long have you been using Tret, how many days per week and what strength?
How often do you apply SPF during a day?
Are you applying enough SPF? I advise doing 2 layers in the morning.
Do you spend a lot of time outdoors?
What colour are your dark circles, brown or purple?
Dark circles can be caused by so many different things, allergies, health issues, thin translucent skin or pigmentation. The cause can be narrowed down by the colour.
Lots of posts giving you incorrect information about Tret, it's the gold standard topical ingredient so long as it's used correctly. It doesn't thin the skin, it increases cell turnover, shedding the dead skin and thickening the fresh skin under it. It takes about a year to show full effect if used 5 or more days per week.
Crows feet are dynamic wrinkles caused by movement, if this really bothers you could look into microcurrent treatments to relax the muscle. For muscle relaxation you could do home treatments with a Myolift Mini or see a professional.
People have suggested LED masks, LED is a fantastic treatment to boost collagen and elastin. However, I would advise you to get a small table top panel instead.
It's both cheaper and more effective, plus it can treat a much larger area than a mask and it can be used on the body for pain or skin rejuvenation. It can even be used on the scalp to help with hair growth, Helios is my recommendation for a panel in the UK, Mito for those in the US.