I'm skeptical of those skin firming creams as well...
I've been doing the dry brushing on and off for a few months, and it definitely improves skin tone. If I was you, I'd do that twice a day, and also try salt baths (as often as possible), and lemon baths. If you can fork out, try clay baths and seaweed wraps (don't know if these last work, but I've heard good things).
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat