I need help with my 2018 old account please

Hey guys, back in the day I used to play on my ps4 with my account i created sin 2018. I made several purchases and I have emails proving i created my account on 2018. However, i tried logging in yesterday and it looks like my account doesnt exist? I tried locating my account using my old display name and it says too many attempts? Now i have like a thousand emails telling me someone tried to access my account throughout the years, but honestly i never cared because i wasnt playing the game until yesterday... Any suggestions?