You should have original pictures along with good content writing which will earn you credits.. if you don't have good content in your writing you will not get credits if you find this answer helpful please leave an upvote to this reply.
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Hi India tourist. This happened with me as well. So instead of updating the photo blog, I deleted and created a new trip blog with better details of itinery and places with same pictures and got 75 credits. You can try this too. Worked for me!
Tripoto rewards you with 0-100 credit points for every published trip, that will be automatically added to your account within 48 hours. How much you eventually score depends on thequality, originality and utility of the shared content.