Seconding @Tazerface@sh.itjust.works 's suggestion of voip.ms.

I throw them a lil cash maybe once per quarter or so, they maintain a bunch of numbers that I may or may not utilize at any moment, but are just too good to give up, and anything I'm not actively using is set up to send inbound SMS to my email - that way I don't lose access to multi-factor codes and such, but I'm not trying to juggle a bunch of numbers in some app or other either.

Dirt cheap, 'just works,' and they even made porting from GV easy.

Also, by the same token, to de-google your email, I'm a big fan of Migadu. Same sort of scenario - I prepay a lil bit once a quarter or so, have catch-alls set up so I don't miss random crap from emails I've forgotten I created/used a decade ago, etc. A nice, simple solution that also plays well with on-the-fly outbound email addressing, Thunderbird for day to day needs, and webmail.