My advice is to not build Slack for Gyms, build XXX for everyone and go to market with an early niche that finds your software useful. Why limit yourself? Only

My advice is to not build Slack for Gyms, build XXX for everyone and go to market with an early niche that finds your software useful. Why limit yourself? Only other advice is to find clients that both have money and have an obvious problem. Don't try to sell to visible companies that you interact with all the time like a little restaurant. They don't have the income to support you. That military contractor that insecure, out of date site that looks embarrassing they are your target market. They don't bat at eye at a $10k invoice if it helps them make more income.