If you are trying to figure out how to grow your users I want to know what you particularly find challenging and why.
Not easy to know where to find them and what is the best canal to reach them
Are you making the assumption by choosing the word "users" that all the people reading your question are software/app developers? What about services and hard goods?
The problems are however not unique to any enterprise. Everyone faces the challenges of:
3) communicating value
@Jean-Vincent Completely understand that. Is this a challenge you are facing right now? What do you believe is the solution/do you believe there is a solution?
@Paul you raise a good point. Generalising 'customers' across multiple different industries or 'factions' of professionals is difficult without including ALL of the terms haha.
When you say 'trust' do you mean trust from the general public about the brand and/or platform? OR do you mean the advertiser/business owner having trust and/or faith in the platform to deliver results?
The biggest challenge i see is founders even knowing who the customer really is.