Fiction will provide you with immeasurably more value than any “self-help” literature ever will. Lessons from fiction don’t just inform you. They shape you, they leave you with an imprint far stronger than any bullet-point list or chart will. Read what you’re actually interested in, and wisdom will find you on its own.
The key to improving is to live through something. If you watch hundreds of videos about working out you won’t get fit. If you read a bunch of productivity books you won’t get more productive. You have to take action to change. When reading fiction you get shaped by living the story through the lens of the characters. This way the characters action is essentially also your action.
If you got value out of self-help books before - then that is great. I have also gotten some value from such books in the past but you have to try and not fall into the never ending consumption cycle without ever taking action on what you learn.