I'm also at around the same spot, it's really hard to get past 100wpm for me. But I found that it's more about mentality now, more than it is ability. Bear with me.

You know that split second as the quote comes up and then you feel, "Oh, this quote looks easy, I bet I'll get a high WPM on this one." Or maybe the opposite, the quote is long, there's a lot of punctuations and numbers, etc. And then you feel the sinking feeling that you'll do badly on this quote and you just hit ESC to skip it.

I feel like this affects me a lot at this point, whether I'll get sub-110wpm or over. I feel like at this point it's about getting into the flow of typing regardless of what comes up, if that makes sense.

I should start off by saying this: this website punishes mistakes heavily. It's a mixed bag. The good thing is that it encourages accuracy. On this note, I like to go slightly slower than pure muscle memory; if I make a mistake, I'm usually more aware and can backspace without too much fuss. The not-so-good element for me has been that anything less than 100% accuracy feels suboptimal (backspacing and going onwards). Given that you can go 100+ on this site, you likely can already do 110/120+ on a site like monkeytype (my #1 recommendation). If I make a mistake and go on, I'm only penalized by the character(s) I missed. At the end I can see how fast a particular sprint was (the graphs are nice!). It's very reassuring seeing that top-end speed and knowing what I'm capable of. Another website I would recommend is keybr. Some other tips I've heard are 'marathon' tests (ex. 5-10min) and slowing down on longer/troublesome words.
Some sites I avoid: typing.com (ztype is fun though) and nitrotype -- I feel like these are very clumsy to use and actively encourage you to speed past errors.
Overall: it doesn't hurt to slow down a bit and focus on accuracy and consider some other websites :)