PRIOR to getting sober, my main motivating factors (that I was aware of) to become sober were: emotional insanity, drunk dialing (legendary! and not in a good way...), financial squandering, avoidance of underlying problems/issues, and the vast oceans of time wasted being, well, wasted. And lastly, and at the time, definitely least, there was the realization that I was damaging my health in a serious way. This is just a compact overview, this list could be greatly expanded.
AFTER getting sober, the inverse of all of the above KEEP me sober. Additionally, waking up without a hangover and enjoying the morning is something that had become utterly foreign to me and now that I have that back, I really don't want to give that up. Waking up sober is personally my main motivational factor, supported by my twin higher powers, Cherry Coke and the E-flat major 7th chord. I realize that might seem utterly simple and possibly even ridiculous (just waking up sober?), but if you've gone years without a 'normal' morning, it really packs a punch. At least for me.
Many good bits of advice thus far, many worthy motivating factors on this thread. I hope you make a smart decision while you still have the good field position that you do. The best to you and yours. Cheers.