How SaaS startup guys get first 100 customers first, make fkn $500k ARR fast?

A small AI company developing an offline security audit Electron app, powered by a fine-tuned small language model for GitHub and local code repos, is struggling to acquire customers. The founder questions how other SaaS startups achieve $500k or $1m ARR quickly without ad spending, as they currently have fewer than five customers and admit to being poor at sales.