Moderate to advanced books?

I would love to hear some of your recommendations on books that you felt really helped you gain a more advanced understanding of investing. Ive been actively investing for a few years now and am comfortable with the fundamentals of the stock market and how markets function in general, but I feel like I’m missing something. I’d like to gain a more in depth grasp on investing strategies and reach that “next level.” In our current market, I’m finding it difficult to make solid gains. It feels to me like everything is so stagnant. And just putting your money in a “good” stock and watching it fly is just not a reality anymore (at least for me). Any book recommendations would be much appreciated. Thank you in advance!