If your style is not math driven, fundamental investing are the strategies you can use.
BTW: the game of investing in the stock market has gotten harder because we have too much data with the historical data. (Efficient) markets tend to eliminate opportunities to make a profit.
Looking at 300 banks would be a good idea.
Distressed Investing is the extreme version of Value Investing. Buy something that has a bad asset, a bad structure, and a bad holders: buy things when “what do they care what price they sell at”, which means you may be able to buy it at less than its worth.
A meta-level way of looking at decisions: “how many people know what I know.” Your strategy has to be both 1) DIFFERENT and 2) BETTER than what other people are doing.
“The correctness of a decision cannot be judged by the outcome.”