Hi, i think you should delete the cylinder, since it already has to high of a polycount, and start over again, I think you will get better results when you start from a cube, extrude faces and use the split edge-ring tool and various other tools to get the desired shape and the detail on places where you need them.
I've attached an image, i only spent about 5 minutes to create this and as you see it already is coming into shape, also when it needs adjusting you don't have to move an insane amount of vertices.
If you stick to your cylinder i recommend using the sculpt geometry tool to paint the detail you want, is a lot quicker.

Good luck with your project