Welcome to DD from me too!
I don't know how you improve your speed other than practice. I didn't learn to type until the second last year at school as it hadn't been a subject on offer until then. But I got a clerical job in the summer holidays and so my speed was way ahead of everyone else in the class as a result, and that was because I'd not only spent the summer keeping up my skills, but in some cases, having been asked to type a police report for court that same day (that same hour sometimes!) I learned to type fast because of short deadlines!
When I stopped using a manual typewriter my speed was probably around 80-85 wpm.
Last timed in an agency fairly recently (for fun) at 120 wpm with 100% accuracy.
Last timed in an online test was 134 wpm but I found myself waiting for the test so the speed was probably a lot higher.
practise
practise
practise!
Jackie
www.iqps.org
Peer Moderator 
