A couple of ideas---one, do NOT buy the Estee Lauder advanced night repair serum, it's a huge waste of money. What will help with both brightness and lines is vitamin c. One great product is OLEHENRIKSEN Truth Serum Hydrating Vitamin C Serum 1.0 oz/ 30 mL . This contains a gentle, stable vitamin c and thioctic acid (aka alpha lipoic acid) which is great for fine lines. If you want something a bit more aggressive, the most famous (and overpriced) product is Skinceutical's vitamin c serum with vitamin e and ferulic acid. It's stupid expensive, because it works, but Timeless Skincare makes a dupe for $25. These serums sting your skin and need to be handled carefully to prevent over-exfoliating your skin, which causes burning, peeling, etc. But, they work, for real. All vitamin c serums will brighten your skin and encourage your skin to produce more collagen.
I don't know if you're already using one, but I would strongly recommend using collagen powder every day to help your skin rebuild.
Another ingredient you want is retinol or a prescription retinoid. There are probably hundreds of retinol serums and creams for sale from Sephora, and they all work. So do the ones sold in drug stores. Retinol has been clinically proven to both reverse and prevent aging. They will brighten as well.
Honestly, because of the severity of what your skin has been through and it would be best if you had help dealing with it, I would strongly recommend you use prescription retinoid under the supervision of a dermatologist. The best way I have found to do it is through a telemedicine service called Curology that gives me unlimited online access to a dermatologist for all questions and concerns and every two months they send me a custom blend of prescription skin cream and charge my credit card $40. They adjust my prescription based on how my skin reacts and how sensitive it is, set up specific goals with me and come up with a plan to achieve it. It is awesome. Curology is the only service I have used, but there are others probably just as good and affordable. I can literally text them a question in the middle of the night and they will get back to me as soon as they get into the office. It is especially ideal for someone who isn't very experienced with skincare. Check this out before you buy anything else because they may put other ingredients like vitamin c in your prescription and you'll have wasted your money.
Whatever you choose, the most important product you need to find is a sunscreen you like and will wear every day. That can be a challenge if you are sensitive, but the brand supergoop! has very popular products in a huge variety of formulas. The great thing about sunscreen is that it HAS to be tested and proven to work by the FDA.
There is so much improvement you can make to your skin, you're going to be amazed. I don't work for any skincare company, but I genuinely think having a medical professional guide you through this is the best way to go and will save you a fortune in products. Good luck!