self-proclaimed

/S EH1 L F P R OW0 K L EY0 M D/
adjective
  1. 1

    Announced by oneself, usually without recognition by others.

    โ€œHe was self-proclaimed king of the mountain. Since it was a mountain of garbage, nobody else wanted the title anyway.โ€

Source: https://en.wiktionary.org/wiki/self-proclaimed