Going from a good golf swing to a great one can be an impossible goal to attain, depending on how you go about it as well as your definition of great.
If you’re trying to equal what the pros are capable of, then you may become very disappointed as you may not have the physical ability and flexibility to replicate a pro type swing. This is another reason why there are more regular golfers than pros.
At the same time, if you focus on what you can perfect within your own physical abilities, a great golf swing may be closer than you may think.