EDIT: Not trying to dissuade you, I guess what I mean is that if you're going to do it you should do it because you're in love with the idea and think you have something new to offer (and can clearly elucidate the problems that other systems don't solve, but yours does)... not because it seems like an easy way to make money. (Which I guess holds true for any business.)
In a market like this, your company will not be a unicorn. If you ever make a billion dollar valuation, it will be the way Atlasssian did it - after many years of grinding through blood, sweat and tears. So you need to really love the problem and be passionate about serving your customers because that's the ONLY way you can win.