A combination of things. Ever since I was young I was always interested in spiritual matters even though I was far away from living a spritual life. As you know I come from an Indian family but my family situation was always shaky so I never really got to explore my own tradition like that. One segment of my fam are ardent devotees of sathya sai baba and since I never liked the whole god men thing it put me off even more....I kind of separated myself from all that and was influenced by shyt the people around me were into like 5%er doctrine, etc; which eventually led me to Islam.... Islam kept me in check at the time which I really needed, tbh.
In 2010 I went to India after a long time and one of my uncles gave me a whole bunch of books on Vedanta that belonged to my grandfather... I started to realize that Vedanta encompasses all beliefs and spiritual practices, monotheism included. The philosophies were much more fulfilling and satisfying. This coupled with my disillusion of the way Muslims behave worldwide helped to cause the shift.
As of now I don't identify with any religion, really, but I do have a spiritual outlook that I'm gonna try to build on moving forward. I was actually gonna make a thread about this but decided not to since the maturity level of the coli is sorely lacking these days.