hi !! i figured it out maybe ?? :) its mono-alphabetic subsitution which u can find on on this website! i do not know how to spoiler messages unfortunately so i may be ruining someones fun with this so sorry to those!!
it says 'HOW INTERESTING. A LOWLY, MEAGRE(MEAGER?) INTERLOPER ATTEMPING TO REWRITE WHAT HAS ALREADY BEEN ORDAINED SINCE THE BEGINNING.'