You have now received your diving license and a brevet. Congratulations. You will be highly motivated to get started and want to dive again soon.
(Should it not be so, we have done something wrong)
When diving, behave as you would expect from other divers. Remember what you learned about “hearing & seeing” in theory lessons.
Bring some mindfulness into the water, some humility. Don’t expect too much. Go into the water relaxed and calm.
The dolphin will then come all by itself. Promised!