In my experience I needed a defined runway before I made any progress. It was only when I quit my job and went full time that I actually started making steps towards being profitable. While I was working, I had too much safety net and didn't make the big steps I needed to. My focus also wasn't in the right place as getting profitable wasn't my #1 priority, it was building the software. Once I had quit then getting profitable was #1 priority and that's where your focus really needs to be.
If you have 6 - 8 months runway and you think you can get profitable enough in that time frame then I say go for it. As long as you are prepared to lose that runway money, as that's what you are risking.
Down the track I can't imagine you would regret giving it a shot, but there is a decent chance you would regret not doing so.
One last point as you mentioned raising funds, if you are reliant on this, it means there is an outside source that you are dependent on which obviously adds an extra risk (ie. if you can't get funding). If you must get funding then I would suggest starting that process right away.