I am so glad to hear that your boy is happy again
Yes I would just give him maybe brineshrimp today and then a mixture of brine shrimp and pellets tomorrow. After that he should be fine to eat his normal pellets as per usual....just be sure never to overdo the pellets because too many at once is a common cause of bloat.
I lost one of my beautiful bettas a few weeks back, I accidentally poured too many pellets into his tank and he got constipated and died. I tried everything but the poor guy did not pull through. I was devistated as he was only about 9 months old
Since then my bettas are on a diet compared to what I used to feed them, they get about half of what they used to get fed. I also have began feeding frozen foods once or twice a week to prevent constipation and bloat. The days that they get the frozen food they do not get any pellets.
I really am so happy for you and SeaGate I hope you have no more worries in the future