Grrrrrrrr!!!!
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Overcome burnout
By lighting character sheets on fire!
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Look deep inside yourself
With a scalpel!
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Take a year off
By going to prison!
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Players character dies?
Shoot player in the face!
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Players kill everything in 3 rounds?
All the time an assassin needs
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Insanity Wolf tells you to suck it up?
Use a straw!
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Seriously though, you started this because it was fun for you and your players. At some point you got away from the things that made it fun for you. You're the GM, get back to that, it's within your power.