My tip to improve your typing speed is to... I don't know, I don't have a good enough grasp or consistency in my own practice to be able to give any good tips. Maybe do the opposite to what I do myself. have consistent practice scheduled, don't over do it, maintain a routine. Have fun with it and accept that you may hit a plateau and sometimes breaks are more valuable than powering through. Though I don't practice any of this so take it with a pinch of salt.