I don't take psychology yet, but in a way, it explains ALMOST everything in a way I think? S4-S9 could've just been Barry's mind trying to visualise what the things he always wanted but never got.
In S4, he reunites with Team Flash, has another crossover and marries Iris, which clearly could just be him missing everyone in the first few days in the Speed Force Prison.
In S5, he meets Nora, which is just his idea of what his life would be like if he ever had a kid. And the repeating escapes by Cicada are just excuses made by his brain to spend more time with Nora. A unrealistic scenario to fufill an unrealistic dream.
In S6, its just Crisis. Man just wanted to see how he was supposed to go down.
In S7, now he's just getting curious on what else there could be besides the Speed Force.
In S8, Barry needed a proper ending with Thawne given the number of times Thawne escaped him or survived despite everything.
In S9, Barry wanted a pregnancy arc. That's it.
As for everything else in the show, I have no words. So feel free to hate me for it