Hello,
In this video i am raising sprinkler height by extending it with 1/2" X 6" pipe riser and coupler. I got this parts from home depot for 0.90$ each. There are various sizes of pipe/coupler available to fit your existing sprinkler system. I prefer to shop in Home depot or Lowes. Entire task was super easy and I was able to get desired height of sprinkler.
Product links:
Let me know what do you guys think of this fix in comment below