My advice would be this:
For any group that you’re going to play in, I’d recommend having an amp that can create the ideal stage/rehearsal volume for the group on its own comfortably.
If you’re doing lots of quiet acoustic, folksy stuff - great. Make sure that when the band is rehearsing, you can hear yourself where you and the band are happy.
If you’re playing lots of loud rock and roll with a loud drummer, make sure you have enough headroom (setting your amp volume well within the safe volume capabilities of your amp) to play a rehearsal at the level you and the band like to hear the bass.
Renting a PA for gigs is an option, and yes, like @terb said - there will be PAs at most gigs.
HOWEVER!! Most PAs are focused on the sound reaching the audience. The sound that you will hear on stage from a PA will come through monitors, and it is a very rare club or stage that will have adequate monitors to give you more bass, if your amp can’t deliver it.
It’s best (says me) to show up with everything you need, and be prepared to dial back and lean into a PA system than it is to rely on a PA system (even one you might rent) that you don’t know and can’t necessarily count on.