Identify potential clients. Go out and introduce yourself and your company. Ask intelligent questions about their business. Listen to their answers. Thank them for their time.
Follow up periodically so that the company stays in your deal flow pipeline and maybe it leads to work at some future date. Maybe it doesn't.
Doesn't matter what magic the consultancy sells, that's how it works: build a big enough pipeline of potential sources of work and statistically there is always likely to be enough work to keep the lights on. Statistically, if the pipeline is not big enough, there won't be.
The size of the pipeline is based on the rate at which the consultancy burns through money; the aggregated probabilities of each potential client to produce paying work each month; the rates at which clients cancel projects, fail to pay, or choose an alternate means of accomplishing their goal; and the amount of time it takes to complete a project (e.g. $10k over two years versus $10k over two weeks).
The larger the consultancy, the bigger the pipeline needs to be. My advice is to start putting numbers into Excel.
Good luck.