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One possibility is reduced radiator capacity. Over time the radiator can collect sediment that cannot be flushed out. Your heater core may be plugged up or restricted also. To check this get the engine up to normal temp and turn it off and then being careful of the fans which can still turn on, compare the temp at the bottom of the radiator to the temp at the top of the radiator, if it is much colder at the bottom than the top, or there are any areas that are cold, that is a sign it is partially plugged and the capacity is reduced.

If available you can use a non-contact thermometer.

If the radiator is cooling it then the lower hose should be substantially cooler.