Entrepreneurs would do well to recognize that valuations offered by investors represent the market clearing price for the startup, and if time and money runs out, there aren’t any other options. Meeting with a large number of investors (100+) well in advance of needing the cash (e.g. > six months) is one of the best approaches (unfortunately this is a full-time job to create a competitive process).
Note to self and to all fellow entrepreneurs, always plan for reserve cash flow. Do not (I repeat) Do not fall into the situation where you missed payroll. You will feel like dying.