I type at 55 wpm, I was wondering if that's a good starting point, my next objective is 75 wpm typing speed

Well it depends on text complexity, you may be typing symbols or just sentences, no punctuation typing tests are also a thing

55 wpm is a very good start, if you get your technique right you could become a pro typist in 6 - 12 months (above 100 wpm typing speed)

Yep, remember to also keep your typing precision high!

We all have our typing quirks but with some effort you can become a monster typing!