The biggest source of relief for oncall for me is that even though my "team" is 8 people. We work on larger systems. We have ~5 teams working on a single code base, so around 30 people. Its not really a microservice, but its not really a monolith (since we have many other, and larger codebases). On call is much more bearable when its once every 3-4 months than once a month.
Being on call requires being pageable and able to respond. This seriously curtails your ability to live your life. For instance, you can't decide to go hiking over the weekend on a whim, because you couldn't handle an incident, were one to occur.