I'm so sorry for your loss.
Before getting another betta, I suggest you sanitize everything with vinegar that way whatever sickness your betta had, it won't spread to your next betta. Go light on the vinegar on the tank, too much vinegar will break the seal.
“Some people talk to animals. Not many listen though. That's the problem.”
― A.A. Milne
Espeon female halfmoon / 10G
Jolteon male dumbo plakat / 10G