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Networking, networking, networking... Do this at local events and meetups and do this at big industry related events. The cost at most is your travel cost and time. Getting connected helps spread the word better early on, especially if you're on a budget and can't afford paid advertising to get the word out. Word of mouth, depending on the context, is not a strategy. Pushing to your friends and family can only go so far. Go connect with people in your industry and get the word out by connecting with them on a personal level. It works out much better.