How young/old are you?
In the 1970s through '90s we averaged 200 miles a week riding tandem and single bike; that's year 'round for 10,000 miles (NOT km) per year.
Our best/worst year was 13,000+ miles.
Never had an issue with over-riding. Currently 80 years old and still pedalin' 100+ miles a week.
If over-tired, take a day off.
Suggest you join an Inchon, Yong-dongpo or Seoul racing club and see if you can 'outpace' everbody. Sort of doubt it.