I want my house to get cooler. .. I have lots of windows in the house
which I
have blinds on to stop the sunlight. Is there anything I can do to
have a colder house?

Consider hanging roll-down OUTDOOR blinds (bamboo or white plastic strips)
on the OUTSIDE of your sun facing windows to keep the heat out.
They re cheap..only $ 10-15 at Lowes
Interior blinds won't stop the heat, the sun has already come thru the glass
and heated the air inside the home.

These have made a great difference in the heat load in our home.