Presbyterian. I think my faith definitely has wavered, but I was atheist and then became Christian, so I have definitely never stopped believing in Christ after my conversion. I would say the thing that helped my faith mature was reading and studying theology (on top of consistently reading the Word). If you haven't already, I would highly suggest you try reading a couple of theological books, as they help answer hard questions, and put worldly definitions in a biblical context.
One of my favorite authors is RC Sproul. His writing is much easier to understand than more old-school theologians. I would suggest the book "Essential Truths of the Christian Faith," which is a book specifically to read a page or two a day. Each chapter (a page or two) has a theological study, such as "Hell" or "Revelation." You can find the book online for free: https://my.mixtape.moe/akqmyc.pdf
As everyone mentioned, fellowship is definitely important, so please don't hesitate to reach out to me at any time!
edit: It seems that the above link doesn't work when you click, but seems to work when you copy+paste? LMK if you would like a different link!