I just checked his sales thread where he is using direct payment options through coinbase commerce. Its really weird to see that you made the transaction without contacting him through PM. Already you have mentioned that you got scammed for 5 times and i think after having all these experience it was necessary to purchase something from trusted sources or by taking the help of escrow providers.

This user was active today and if i am not wrong he got your PM. I will suggest you to wait little bit more for his reply and hope he will give response. If  he don't make any response within next 24 hours then don't hesitate to update the topic and i will definitely tag him.