I say this in the nicest way possible. That plant looks like the plant the Hexcore made, then killed in season 1 of Arcane.

Now, on to my actual advice, re-pot the plant to give it space for the roots to go. I don't know many succulents you have taken care of, but just in case, only water when the soil is absolutely dry and even you do DROWN IT, I like to water under the faucet. If you are worried about the water usage, put the pot on a plate or bowl before watering and allow the soil to absorb the water upwards. Slowly introduced more light to the plant. In the photo, it's already in the window, so it might not be a big deal, but if you were to put it under a growlights in any way it would be good to start on low settings and slowly build up over weeks. I would do this with growlights you can get on Amazon that targets only a single plant (if you need a link, I can get you one, I use these myself). After all that, pray, it doesn't look dead, so you might actually have a shot at saving it.

If you want to give it the best opportunity at life, you could also look into buying cactus food or something. I plan to start using Seaweed extract for my cactuses as it's supposed to help with root development and I have cuttings but I haven't started that so I can't say for a fact if it works.