Looking for a female main character with female friends (because I'm tired of reading about the vengeful ones) who help her kick ass. It may be a transmigration, historical, or cultivation story. Not a harem.
Hmm.. if you liked movies like sucker punch where the MC is a badass, then there isn't much that I know of. With 'I said make my abilities average' the MC is really kind and not a badass, though she is op...
Itai no wa Iya nanode Bōgyo-Ryoku ni Kyokufuri Sh... Convenient Woman (may not seem like it at first but this is exactly what you are looking for) Like Hell I’m Gonna Get Captured! The Reincarnated Vampire Wants an Afternoon Nap Nigotta Hitomi no Lilianne (slow/slice of life) The Magnificent Battle Records of A Former Noble L... (a bit of a stretch but if you read until around chapter 12, then you might understand why I recommended this on your thread)
Nighthunter, maybe? The lead is definitely female, but I'm not sure if her friend that can switch genders at will and simply chooses to be female counts. There's more powerful females than males though and no harem, or even any sign of a harem, as of yet.