Go up three teeth on the back sprocket instead of down one in the front (They will eaqual out the same).
#1 A smaller sprocket up front is harder on your chain as it now has to bend tighter to get around the smaller sprocket.
#2 On some bikes a smaller front sprocket will cause the chain to rub on the top of the swingarm.
One thing though, if you decide to get a bigger back sprocket you will need to make sure your chain currently has enough slack for the longer length.
I know this might not be in the budget for everyone. But When my chain bites the dust I also change both sprockets at the same time.
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