i cannot access my apple watch

me and my family switched to the sprint carrier. and when we had sprint i had gotten the iphone 11 in purple. when i had the phone i had also gotten an apple watch from best buy. i was able to use it just fine but a few months later sprint didn't work out and i had turned my phone back into the carrier but never got my old phone back. me, being a first time apple watch user, didn't know you had to sign out of the apple watch using the app on your phone. so i did it through the apple watch, after i had returned the phone. i thought that did the trick but when i got my new phone i wasn't able to access it because it's still connect to the old log in from the phone that i turned into sprint. but, i used a different icloud acc that i had just made because i didn't want to rick anything new with my main icloud account. but it's been so long i don't remember the rest of the icloud and password. the watch app says it's s•••••@icloud.com but i can't remember it exactly. i've called before but i can never get someone that speaks english and can understand me or they have no idea what to do. and i'm telling you right now i can't be the only one in the phone world owning one of these and this has never happened before. i'd like help because i cannot afford another one.