Desktop screen brightness problem

[Windows Server]

I accidentally hit a bunch of keys on my keyboard all at the same time and now my main monitor screen on my desktop windows 10 computer is very dim. It seems to be stuck like this and I can't find a solution in settings. My secondary monitor has no such problem but when I use the Windows & Tab keys shortcut to show all my open windows my secondary monitor goes black. My other new problem is with my mouse. On my secondary monitor it feels sharp as per usual, but on my primary my cursor feels very laggy and slow. Not sure how I managed to create these problem but it must have been some sort

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