Here are my thoughts after years of military and law enforcement training.
The most important issue is for you to be comfortable with your firearm. You should know your weapon better than the back of your hand. The feel, operation, and mechanics should be second nature. Know how many rounds are in it at all times as well as its current state (loaded, unloaded, on safe, cocked, decocked, etc.). This may sound silly but stop yourself in the middle of a range session and quiz yourself. You may be surprised on how little you know about the current state of your firearm.
As far as shooting skills, after tens of thousands of rounds at ranges I only got good enough to a certain point. My skills reached a plateau. It wasn't until I removed myself from the controlled range scenario which put my skills to the test and learned I couldn't shoot for anything when it mattered. I took a military combat handgun course in Virginia Beach at an outdoor range which changed everything. Learning how to shoot well with your heart rate up and under stress will greatly improve your skills. This is also the most common scenario you will face when confronted with a defensive situation. I know we live in Florida and courses like that are hard to come by and sometimes costly, but they're worth the drive and dollar.