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You need to get off of HN/Indiehacker and go actually talk to your potential users. You don't need "some sale guy", YOU are the sales guy.

Right. But I am inexperienced and tried so many things.... I need somebody to help my with the sales part, as a mentor

I actually do some weekly 1:1 sales coaching for this very problem. Check my profile and feel free to email me if you have any questions!