Brightness not working

Hello I have a windows 11 dell laptop and just recently got it over the summer. For the past few days I havent been able to adjust my brightness setting and im not sure how. I would check my settings and follow some instructions but im not sure if i'm missing something or doing something wrong. Whenever I try to turn on my night light as well it doesnt work. I would turn it on but nothing would change. 

Please help me :(