To increase SaaS free trial conversion rates, avoid seven key mistakes such as insufficient product knowledge, lack of follow-up and sales cadence, complex user interface, targeting the wrong audience, improper lead nurturing, inappropriate trial length, and unnecessary initial barriers. Focus on providing comprehensive product knowledge and support from the start, maintaining a consistent and non-intrusive follow-up cadence, designing a user-friendly interface and onboarding process, personalizing the user journey, finding the right trial length, and eliminating sign-up barriers. Consider using tools like Togai for effortless pricing and billing infrastructure to enhance your SaaS product's trial to paid conversion rates.