a) Microservices are a 20+ year old concept and for the right use cases are a better choice than monoliths. Likewise the reverse is true. Being successful with your architecture is all about being pragmatic and choosing the right tool for the job.
b) Don't fall into the trap of being obsessed about what is cool or not. No one really cares other than you and it isn't going to affect your career prospects despite this being a popular myth.
c) What does affect your career is being narrow minded, acting like you're smarter than other engineers and being closed off to other ideas. You should understand micro services, monoliths, 90s style SOA etc. You should understand everything. Why they were invented and their relative strengths and weaknesses. Being able to articulartly defend your architecture is a fundamental aspect of working in IT.