Thanks a lot everyone!
It took me about 2,5 months to make my first sale but according to what I read on previous threads, once you manage to make your first sale it becomes easier and easier to make sales, the hardest one is the first one (please say it is true!). So I'll keep working.
I have some YouTube traffic but can't say it adds too much to the website. And the day I made my first sale I got only 11 visitors. I need traffic seriously...
I'll keep working harder now.