i’m an idiot and left my fiancées laptop plugged in for like 2 weeks

when i was moving and reorganizing our room, i moved his macbook (2019) to our desk and plugged it in and then left it plugged in for a while and now it will not turn on AT ALL. oops :/ i just wasn’t thinking i guess… even though he has told me multiple times to not leave it plugged in anyways.. i feel HORRIBLE and want to either replace the laptop altogether or just the battery. i cannot afford a brand new $1,000 laptop.. but i could afford a refurbished one. i can also afford $200-$300 to replace the battery. my issue is i dont know how much longer the thing will last and i dont wanna waste money on a battery if its not going to last. i also dont know if geek squad or apple would be better to go to if the better option is to get it fixed.. or where to go for a refurbished one if it comes to that. SO! what are your thoughts, people of the Apple community?