Just be sure to call in sick and state "fatigue" as the reason. Make sure it's been marked in your roster as SKF since crew scheduling will try to not mark it as fatigue and make it look like you "just" called in sick. Unless we create hard evidence for fatigue issues at the airline, nothing will change.
Had my medical recently and talked to the doc about 92+ hr rosters and fatigue, they are very supportive of changing this but can't really do anything unless pilots report unfit due to fatigue.
As per 3-Pilot ULR's, just do one and call in unfit due to fatigue right after and go to the clinic and get a couple days off to recover, hopefuly missing a flight or two. Since we are so incredibly short on pilots, that will throw quite a wrench in the system and cause a lot disruptions.
Remember, without evidence and a paper trail NOTHING will change.