Agree I got out of 45's due to cost. Much less expensive to practice with 9's. I shoot twice as much now that I am down to one centerfire that I carry. I still suck..... I just suck more often and can be twice as critical as I shoot twice as much. I really need to take a class.
I don't know how deep you want to dive into shooting, but I got obsessed. I would check out some of Max Michel or Ben Stoeger's training videos. They were both world champions multiple times. See how your grip, stance and draw compares to how they do it. Dry fire way more than you actually shoot. Get a shot timer app for your phone. I used to set a par time and see if I could beat it doing various drills.
A couple things that helped me shoot faster:
Consistent setup of gear. Holster and mag pouches have to be in the exact same spot every time.
When you draw, don't move your head. Stand perfectly still and bring the gun up to your eyes. Practice it until you can draw with your eyes closed, open them and have a good sight picture on target. Watch how Max or Ben does it.
Learn what you need to see to make a shot. This is what I think gains the most speed. Most of the time, people try to get a perfect sight picture on every shot. At 25 yards it's important. At 3 yards, it's not that important. If it's close enough and you have a good stance and draw, you can start shooting before you get your gun up all the way.
Check and see if any of your local clubs have IDPA or USPSA shoots. You will learn a ton and I guarantee you will be a better shooter. IDPA requires a little less gear but tries to be more real world. You have to have your gun concealed when you draw and they require shooting from cover and some other "tactical" rules. I think each stage is limited to 18 rounds. USPSA is just balls to the wall shooting. Maximum 32 rounds per stage, moving targets, steel, plate racks, Texas stars it's awesome. IDPA does have some moving targets and steel but not nearly as much. They do have cool scenarios. I've shot out of a car, truck, one place had it setup like a shoot house. Both are a lot of fun. I have to start shooting again! I hope this helps.