You can drill a hole through the wall above the cement blocks in the center of your hole and cut the rest out with a saws all.
Cutting a hole in metal siding for dryer vent.
Use your old duct as much as you can salvage and use your old dryer vent and buy some metal tape to seal the joints.
This video will show you how to install a new clothes dryer vent through a laundry room wall to the outside.
If the hole is a little high or low measure the distance from the pilot hole to the center of the vent cap duct.
Transfer that measurement inside if necessary to mark the new dryer vent center.
Place the vent cap over the hole so that its top rests on the high point of the siding.
Check the hole from outside the home.
Make sure no wires or plumbing is in the way.
Dryer and exhaust fan vents are only two reasons why a home owner would need to drill a round hole through an exterior stucco finish.