How far we’ve fallen since the days when usernames were opaque numbers and anonymity was prized.
There are still plenty of email providers left and right that will allows you to subscribe without a phone number. You’ll probably have to pay though. What may be harder in this precise use case is getting a domain name (which is not mandatory but really helpful if you want to be able to switch providers easily) but I’m pretty sure you can still register domains with a landline number.
Where I live, going without a phone would be incredibly tedious, as it handles bus and train tickets, tracking for hourly busses, no ATMs within walking distance and it's basically standard for local events to do "sign in" by having you scan a QR code and so on.
Not having a phone would mean budgeting much more time for going anywhere and having to carry change for the bus.
But if you have a car, you get to bypass most of that, no need to worry about tickets or tracking, ATMs don't need to be very local either. Then if you don't really care about attending local events, you get to avoid everything.
If on top of that, if your job is accomodating, you could conceivably go without a phone entirely. My job would crawl to a near stop if my coworkers had to wait for me to be in front of a laptop/desktop to respond to them.
Even here in Denmark that's still an option.
[1] https://www.ndr.de/nachrichten/niedersachsen/Deutschlandtick...