First of all, don't worry too much. It took me 10 years and 2 startup failures before building one that is now > 10M€ in revenue. So failing is part of the process.
Here is what I'd recommend:
1) take a week off and rest. The startup way of life is very demanding and being exhausted can impair your judgment to answer the very importance question that all founders face at some time: Should I quit? Or should I pivot? Or should I persevere.
2) evaluate what I believe is the most important startup metrics: market traction. After so much cash burned, you should have at least an idea if your solution is truly disruptive or if it is just 'nice to have'. If it is 'nice to have' I recommend you quit.
3) if you decide to quit or are not sure, return the money to the investors in order to preserve your credibility for any future venture project.
Remember that being an entrepreneur is not a one-shot journey. It's a way of life. With time and experience you will get better at it.
Here is what I'd recommend: 1) take a week off and rest. The startup way of life is very demanding and being exhausted can impair your judgment to answer the very importance question that all founders face at some time: Should I quit? Or should I pivot? Or should I persevere. 2) evaluate what I believe is the most important startup metrics: market traction. After so much cash burned, you should have at least an idea if your solution is truly disruptive or if it is just 'nice to have'. If it is 'nice to have' I recommend you quit. 3) if you decide to quit or are not sure, return the money to the investors in order to preserve your credibility for any future venture project.
Remember that being an entrepreneur is not a one-shot journey. It's a way of life. With time and experience you will get better at it.