This was interesting to see because I thought it would be a long process to fix.
Sometimes it takes replacing a valve, cartridge, or getting a new showerhead.
Remove the rubber ring off with a pair of a tweezer.

Image by Bear Reality via YouTube
It indicates more openings for the water.
This will allow the water to flow out faster.
plant the showerhead back onto the shower and test.

Overall, in this video, there was a huge difference in the water pressure.
Its a quick video if you want to improve your water flow in the shower.
After watching this tutorial, it seems like a practical thing to know.
