Congratulations in obtaining your wishes.
First of all, in the Buddhist way of looking at things, if you made a promise, then you must keep it. If you don’t, they (meaning the Buddhas and Bodhisattvas) probably won’t take anything away from you, but don’t expect much help the next time around.
Furthermore, eating vegetarian is very healthy and compassionate. We’re showing our respect for living beings when we don’t eat them. Try it for a while and find out for yourself. Initially, you’ll have to face your friends and family’s objections and concerns: they’ll say that you aren’t getting enough protein, or you just want to draw attention to yourself, etc. Of course, almost all of their objections are wrong . I’d like to suggest that you read up on the topic and talk to as many people as you can find who have been vegetarian for a long time.
Finally, I hope that the responses you received will convince you to lead a virtuous and decent life. The Buddhas and Bodhisattvas always protect and help those who are good.