No alcohol, no smoking, hrt if you are perimenopause, daily broadspectrum SPF of at least 50, reapplied if more than 2 hours in the sun. Not just a moisturiser or makeup or bb or cc cream with spf in it as you won't use a thick enough layer.
Retinol or tretinoin (prescription only but there are online dermatology services dermatica and skin+me). Medik8 crystal retinal is good for sensitive skin. Retinol can be very irritating and drying. Tret can too. Skin can get used to them though.
Exfoliating acids (AHA, BHA, PHA), be careful if your skin is sensitive. Paula's choice are probably the best to try, you can buy travel sizes. Biologique Recherche is the expensive but amazing brand. So many cheaper options out there too, can't vouch for any of them. Glycolic acid is harshest I think, lactic and salicylic and mandelic are more gentle and can be moisturising/hydrating.
Tranexamic acid for evening skin tone and marks from break outs. Not an exfoliating acid.
Hydrating your skin as well as moistruing it, vichy mineral 89 is popular but I find cosrx snail mucin essence stuff a lot better, obviously weird and problematic if you are vegan.
Vitamin C but has to be a good one especially if you have sensitive skin, Skinceuticals C E F is the most expensive and best, geek and gorgeous is meant to be good. Vitamin C can be irritating too but gives a great glow. Can help fade dark spots.
Non irritating options are peptides, you'd have to look to see what companies offer them in anti ageing formulas. Matrixyl is the most common as far as I know. I used The Ordinary peptides and they were fine. Boots no 7 not as effective.
Foreo Bear electric device thing. I use mine with the Cosrx stuff. Makes me look less tired and fresher I suppose. Gives a slight lift around the eyes and provides glow. It's probably the easiest, cheapest (after initial purchase) and laziest thing to do as it doesn't require any great routine or layers of serums and so on. Clean face, slap on gel, massage face for 3-5 minutes, moisturiser, spf if morning time. Two or 3 times a week.