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What kind of system do you have? A heat pump or standard central AC?
I'd have to know that before I can help you with wiring.
Whats the make and model of outside unit?
That doesn't help. Need you to find a tag on outside unit and give me full model number.
Looks like a standard central AC. Your wiring seems to look OK. You don't need the blue on O
Your unit could be low on charge.
When is the last time unit was serviced?
Your unit could be low on charge (refrigerant). Then it would cool somewhat, but not as good as it once did.
Is the outside unit running?
The wiring looks OK. Green to G, red to RC-RH, white to W, and either yellow or blue to Y depending on which color is on Y down at the furnace.
You only need one on Y. The "O' doesn't come into play on a standard central AC.
Go down to furnace, find where the thermostat wiring comes into the board. See which color is on Y
Did you have additional questions on this?