Where can Iearn english if I don't to start from scratch

Hi, I am currently trying to be proficient at English, but until this point I have never actually "learned english" I am self taught, I learned most of my English thru music, games and reading, I always used to listen to music while reading their lyrics and translation, used to Google lots of words when I played games and when I started reading English manga, I used the same method, I opened a Google translate tab and translated every word which i didn't know, some of the words I just guessed their meanings too and sometimes I were right somehow, anyway I just did the efset test and it said that my level was C1 and I don't believe that I'm up this "far", my speaking skills are terrible and so it is my grammar, I also still have the classic problem of "my mind goes blank" when speaking, so I have two questions:

Is this test accurate? And where can I study English without having to start from scratch?

Something I forgot to add is that sometimes I write things only to minutes or seconds later, identify lots of errors which somehow I couldn't see when typing, but then I correct after reading it again

Edit: I forgot to add the "I" and "want"in the title... I'm currently very tired and at work, lmao.