OP: It really depends on what is bothering you, what kind of personality and thinker you are, why this is bothering you, your level of education, ect.
Different thinks speak to different people, and oftentimes, things on emunah that don’t speak to a particular person will actually have the effect of creating an even greater crisis in emunah.
For example, I can handily deconstruct and destroy just about everything Lawrence Kellerman writes on emunah, find R. Avigdor Miller’s writings to be polemic and completely unconvincing, and think that R. Arush’s (and R. Lazer Brody’s) books are actually rather laughable. Additionally, I find that the philosophical works of most Rishonim (Moreh Nevuchim, Chovos Halevavos, Abarvanel, ect.) are dealing with questions and are giving answers that are completely irrelevant to my considering my own experiences and education in the contemporary world.
By contrast, I find R. Samson Raphael Hirsch’s ideas to be absolutely compelling, although in large part he mostly ignores the issue of “emunah” (in its usual sense).
Each of these kinds of works were written to speak to certain kinds of people.
You should try to talk with people who are broadly knowledgeable about many areas of knowledge, and they may be able to steer you in the direction of works that are more likely to appeal to your own unique intellect and sensibilities.