You have lost faith in your business model, this sounds like a common problem with many startups. Trying to build a startup (that is indeed a company) with a weak business model or inexistent and have faith to raise enough funds to survive for long.

You had bad luck and I surely do not know all the info but if you do not trust the monetization model it might be because it was never clear from the beginning, and do not forget, startups are companies and companies make money.

If you feel so frustrated just jump form the ship before it sinks, i have shut down startups because i didn't feel we would be able to make money (luckily we were always very early stage).

Saving yourself is always better than collective suicide.