Hey Ray, thank you!
Ive been there, trust me. Abs have been a stubborn thing for me to develop, but they’re for sure improved this time.
I honestly think it boils down to time, consistency, and maturity in development.
As far as exercises go, I train them fairly low volume, but high frequency. I try to hit 5 sets minimum following cardio on non leg and back days via 2 movements either straight sets or a superset fashion. Off training days I’ll tend to do more excercises and sets. Movements I stick to are lying leg raises, rope crunches, ab rollouts, hanging leg raises/knee raises. 12-15 rep range.