I reincarnated in to my novel

i was just a normal guy who wrote the novel i got reincarnated in to a magical world, and that novel was a success and became pretty popular. but one day when i was writing my Finale chapter someone broke in to my house and killed me, and when i woke up i was confused at first but then i realized i was reincarnated in to my own novel, and to top it off there was 4 new characters that i didn't create. and btw the reason i wrote this novel is because i want some experience before i write my main novel, and by the way this novel was created on webnovel and not on this app