I went through a short beat-the-casino phase for kicks. You can increase your edge significantly beyond standard card counting by targeting flaws in casino randomization methods. Randomization is hard. For example, card shuffles aren't random, not even mechanical ones, and particularly not human ones.

It is possible to carefully observe and model a variety of randomization processes at different casinos, find a weakness in a particular game at a particular casino, and construct a profitable strategy that is nearly impossible for the casino to anticipate. Even so, they will eventually notice someone who is a consistent winner, assume you are cheating, and force you to play a stressful game of cat-and-mouse that will lower your expected profit, increase your variance, and lead to a less-than-desirable lifestyle, in my opinion. A team can improve these things at the cost of adding management and human resource headaches.

If you have the talent to succeed at this, my experience is that the same talent can be applied in much more productive endeavors that pay far better and yield a much higher quality of life.