Depending on the chemical and physical age of the battery, how it was stored and used,
these factors and not just a random cycle count make a lot of difference. If the battery
is conservatively used and Mac allowed to charge at every opportunity, that's best.
• How to reset the SMC of your Mac - Apple Support
https://support.apple.com/en-us/HT201295
A low cycle-count accumulated over 6 years may not be any different to the hardware than
an actively used short term number of cycles. (Exercise, more or less, isn't factor in this case.)
My portable Macs rely on the AC power adapter, for most their usage. Battery cycles are low.
• Get help with your Mac notebook battery - Apple Support
https://support.apple.com/en-us/HT204054
When running on battery, dim the display; and conserve battery in all ways possible; then
use the Mac on AC adapter, without running the battery low; so as to not damage battery.
Perhaps time has arrived for portable Mac evaluated; plan for service inspection of charge
system, (ports/cables) w/ battery replacement. Expect it may cost a bit, to keep Mac its toes.