The "turn over time" is not necessarily of much help. Concentrate on accuracy instead. It must become ingrained in you, so you don't even have to even think about it.
Avoid glitzy "classes" that charge hundreds or even thousands of dollars and claim to make you an expert in a weekend, or pretend to train you as if blackjack is a video game. Reading and practicing is the time-tested method, and probably always will be. Ignore the bloviating YouTube "influencers."
You will eventually need all the software published by qfit.com. Remember the name Norm Wattenberger. He is blackjack software royalty. Not only is his product far above any imposters out there, his level of customer service equals it.
Here are some books you need to read and understand. Re-read any parts that don't make sense, until they do:
Beat the Dealer by Edward Thorp, for historical context
Professional Blackjack by Stanford Wong
Blackbelt in Blackjack by Arnold Snyder
Blackjack Attack, 3rd Edition by Don Schlesinger
Modern Blackjack by Norm Wattenberger
The Law for Gamblers by Robert Nersesian
You'll find more books you will want to read as your knowledge and skills increase.