If you’re not an amateur at all, that you actually have been playing basketball almost all of your life but you stopped after graduating high school, can at the age of 23 you start grinding your way back to reach the NBA and successfully thrive in it for years?
It’s technically possible, but extremely unlikely. Those 4-5 years after highschool are key and you’re going to be playing major catch-up against kids 5 years younger than you.
Best bet would be to take the VanVleet route. Hit a g-league open tryout and go from there. He was 20/21 when he started though, and that was after going undrafted after playing at a pretty high level.
It’s going to be tough and realistically the best case scenario is you grind incredibly hard for 5 years before playing 4 garbage time minutes in a blowout after getting called up for a game. Even that is an incredible achievement.