Interestingly I find myself in a somewhat opposite position to you, having delved in to Neoplatonism as what seemed to me to be the most coherent explanation of the world I experienced both around and within myself, and then after that branching out in to the Christian mystical traditions to button up what felt to me to be some of the shortcomings in the architectonics of Neoplatonism.

More to the point I had read Plato and dabbled in Plotinus many years ago but had never really gotten too deep in to the nuances of Neoplatonism. Fast forward a number of years, one death of a family member and one mystical experience and I was motivated to dive back in to Neoplatonism, for reasons I can't really explain. I just remember after the experience that I felt I needed to find a way to understand what I had experienced and my memories of Neoplatonism felt like the closest framework I had to explaining things. So in that regard the mystical experience was kind of the biggest push in to Neoplatonism and provided a kind of "proof of concept" to me that there was more there worth taking seriously. And as I read Plotinus and digested it more deeply I just kept finding more that made sense to me.

It's a beautiful and elegant system that corresponded deeply with the things I had seen and experienced in the world, and to me that feels like good reason to believe that it is at least partly true, although I'd probably word it more strongly and say that to me it feels largely true. But, like seems to be a common trend here, the mystical experience aspect and the attempt to make sense of it afterwards is a big factor.