Thanks for the vid! Can see how this was a weapon - it has some decent heat/racket head speed, and once you brush off the cobwebs youll be flying again in no time I reckon.
Are you conciously trying to jump when you serve? It just seems that a lot of your leg drive is being used to get you to jump up vertically and not into the court at all. There is only a limited amount of forward momentum and you seem to go up and down on the spot a bit. This might be inhibiting your serve speed.