My skin has been looking dull lately, so please recommend some skin care products.

Lately, I've been working overtime a lot, and I've noticed my reflection in the subway mirror on my way home from work looking incredibly dull. My coworkers have been telling me I look tired, so when I look in the mirror, I notice how flabby and dull my skin looks. So, I've been thinking I really need a recommendation for a good skincare product. Before, any lotion I could just apply would instantly brighten my complexion, but now, perhaps because of the office heater, my skin feels incredibly tight. My friends are already meticulously using home care devices and highly concentrated functional ampoules, and I'm worried I've been neglecting my skincare routine. Do you have any recommendations for good skincare products you're using? A more affordable option would be great, but I also appreciate value-for-money products that I can use every day. Could you recommend any skincare products you've used that have been particularly satisfying, whether they combat dryness or brighten my complexion? I'm curious to know what routines you all follow to maintain your skin's condition.