This is a job for a plumber unless you have a ladder. The vent pipe may be plugged or the trap in the toilet may be plugged up but this requires removing the toilet from the floor which is not that hard. two floor bolts and and turn off the water valve and disconnect the water hose then lift the toilet up and see if there is blockage by poring a gallon of water into the drain pipe. if it backs up you need to snake out the main line. You can rent a electric 25 foot snake for 35 bucks but then you have to reinstall everything plus buy a new wax ring which is about 5 bucks. if the pipe is clean and drains fine then you need to run water into the toilet outside to clear the throat of the toilet if there is no blockage then the vent pipe may be plugged and that you have to get from the roof. Best bet is call a plumber.
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