Yesterday I changed my phone's battery. Now guess who stuck with broken loudspeaker phone..

Man, I miss the old day when you can pop that back cover and change the battery.

showering without music sucks, but man, youtube before bed? give your brain at least half an hour to calm down when you go to sleep. no media (except books) and you'll be sleeping like baby. maybe it's not the worst thing to happen to you :)

It's not difficult, I've changed a few batteries in some Galaxy S6 phones you just need a heat gun, suction cups and some thick gloves 😉

Well... get a bluetooth speacker. Best workarround if you don't want to buy a new phone.
Btw old Android phones are good servers....