My typing isn't totally conventional and I can get up to like 115 wpm. A couple of things I do is type p with my ring finger instead of pinky and I do the same with semicolons. I'm not really sure why, just a habit I had when I started and never really broke it. I'll also sometimes use my index fingers to type k and d depending on where my fingers were at prior to those letters (like if I just typed a letter on the top row).

There is unconventional fingerings and there are unconventional keyboards.

I use a Corne keyboard programmed with QMK. I type Enter, Space, Backspace and Shift with my thumbs using the six thumb keys where a space bar might be.

One thing I think helps improve the speed is that my shift keys are set as "one shot modifiers". So I don' t have the hold down the shift key while typing the next key, I can just tap the shift key and tap the next key. This is notably more comfortable if holding down shift would otherwise require my hand to be stretched out.

Also, thumbs are stronger than pinkies so there may some advantage to using stronger digits.

Symbols don't show up much in the quotes on this site but one that occurs fairly frequently is the dash symbol: "-". In my layout, this is on the third row to the right of the P key rather than above it on the fourth row. I'd say it's a little faster to reach.

With practice and an unconventional keyboard, my typing speed improved from about 65 wpm to 90 wpm.