My mic is too low even while on 100 in the Sound settings. How can I turn it up even more?

Well you can't turn it up past it's max setting in Windows. What you can do is try another mic too see if your current one is faulty. That's the first step -- just to check whether or not your mic is faulty --- then get back to us if new mic has same problem.
 


I don't have another mic :/
 
Not many of us do have spare accessories or devices for everything --- but at times like this, if it was me, I'd order a basic one for next-day delivery if you can't get to a PC shop.

It's essential you can prove there is nothing wrong with your existing mic before you start trying to find something wrong in Windows (which can often take a great deal longer than just trying a different mic).
 


I feel like I remember a boost mode for the mic idk
Can't I just...increase output?