my watch is locked by a apple id that i dont have access to anymore so i cant connect it to my phone even after resetting it

I have an old apple watch that i was using fine with my phone but i wanted to reset it to try and speed it up however when i try to reconnect it to my phone again the watch is connected to an old apple id that i dont have access to anymore. even after factory resetting it i cant get it to connect to my phone because i dont have the password for that account. how can i log it out of that apple id without the password.