In the remote past, the Buddha converted me. I emerged from the Earth when the conditions for my appearance gelled. Isn't that why everyone else is here, doing what they do?
Alternatively, I was Born into This
I considered Tendai and some Tibetan traditions over the years. Frankly, I don't find any of them urgent, at least on a level beyond the individual, and right about now, humanity's ills seem pretty urgent. Nichiren Buddhism seems to be one of the few traditions that is unflinchingly devoted to propagation of Buddha Dharma. I believe this is the spirit of the Buddha embodied in his decision to begin turning the wheel and in the spirit of Zhiyi's teaching on practice for oneself and for others. I also have a hard time taking elaborate trappings of ritual seriously, which just seems vain to me. I hold this view toward some Nichiren traditions that incorporate folkish practices, as well. I considered but couldn't get with the stripped down interpretations offered by Zen traditions because all in all, they seem to revert to the pitfalls of the individual vehicle.
I've taken up the tradition I was born into in earnest because I find the Lotus Sutra to be profound; this practice has been beneficial to me, and I am impressed that it is beneficial to others.
I'm probably not a good person to offer insights because at the end of the analysis, it can simply be argued that I am just keeping up with what I was indoctrinated in from birth.