Hello Charlie and welcome to the forum.
Unfortunately, you must have done what I also did; loosened the adjuster when it wasn't necessary.
Also, unfortunately, there is no quick remedy for this adjustment. Try to put it back as close as you can by eye, then ride and try shifting, up and down. If it isn't right, turn the adjustment screw maybe an 1/8th of a turn (one way or the other) and repeat trying. Sounds simple and really it is, but don't settle for anything less than perfect on the shifts.