Getting back to natural hair colour

Hellooo guys i desperately need help , ive always been using box dyes and colour cream tubes and i have switched to many colours like red to black to red again to having an ombre etc all at home and recently i had green ends which faded too quickly anyways I want to get back to my natural hair colour or a colour that is close to it ! i belive I'm a level 4 (dark brown ?) can you please help me i don't want to use colour remover i never used it and my hair is damaged af from bleaching i was thinking about colour correcting it but I'm scared i won't get the result that i want !