if you dont copy the key and store the json file your in a bad position
but if you keep it in your pc, and accidentaly deleted it, i can help you with that
i can crawl in your hard drive to get the file with the keys written on it
as long as you deleted a word file or notepad, but if you dont copy or save the json file
then its lost, feel free to pm me we might recover it as long as its windows pc