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Check blower wheel and indoor coil to make sure they are clean.
Both will be in the air handler in attic. Also feel of the large copper pipe between units for signs of an iced indoor coil that may be restricting air flow.
There will probably not be specific instructions in print,but if you can get me the model on indoor unit,I will be happy to guide you step by step.
Coil will be in bottom.Look from under unit with a flashlight to see it.Blower will be in top panel
This will be more than a simple answer but will require step by step guidance.I am only paid for my time by ratings and services provided,I will send an offer if you would like to pay me to go though step by step instruction.