I have a lot of confidence in the power of the Torah to change everything in peoples lives.
My suggestion is mainly to learn Gemara, Rashi, Tosphot. For that is the Oral Law.
I get the impression that not everyone feels the same way as I do but I think that is because they have not tried it. It is like ice cream. How can someone not like ice cream?
You might intellectual questions about ice cream. Were the cows treated properly? Was the factory inspected? Is it good for you? But how can someone not like ice cream if they have at least tasted it? The Torah is the same thing.
One condition:
This works as long as you are not learning pseudo Torah, and as long as you are not learning from the charlatans and scam artists that put on the right clothing to make it seem like they know Torah.


And there are lots of scam artists. The way to avoid them is to make sure you learn Torah only in a legitimate, name brand Lithuanian Yeshiva. That is Ponovitch, Brisk, Merkaz HaRav [in Israel] and  Chaim Berlin, Torah VeDaath and the Mirrer in NY. Nothing else.
Better to have nothing than to buy a fake product. Don't accept anything but the name brands or their legitimate branches.