If you were to explicitly write the hydrogens, you would find there is a hydrogen alpha to the carbonyl. If it is removed, it will not be present in the product. The initial protonation is correct, but I suggest you use the nitrogen in the next step to do the decarboxylation, no other reactions, just loss of CO2. Then you can tautomerize to make it aromatic. If you need to, try drawing this in every way possible if you are not realizing my hint.