Tripoto gives the credits based on the quality, content and originality of the pics / write up. It usually takes 48 hours to receive an email whether you scored any credits or not. If its over 48 hours then you can write a mail to tripoto about your query
If the trip you have published is repeated on any other platforms and if the trip does not add any value, tripoto doesn't add in credits. If it does not have neither of this, you have to wait for 48 hours and then contact tripoto support. Also do check tripoto credits guide.