If you find only one channel that will work, then you have the business. You don’t have to diversify the traffic; it’s enough if only one channel works, as long as it works well.
Ask these questions to find out what channel is best for your business:
Are people using search engines to find a solution?
Search Engine Optimization or Marketing (SEM).
Do existing users share your product via word-of-mouth?
Virality or referral programs.
Does having more users improve the experience?
Are your target users already using another platform?
Integrations and partnerships.
Do users have a high lifetime value?