My ac is stuck blowing on the floor setting and I cant switch it?

**POSSIBLE** failed 'mode' control actuator , Can be physically/visually verified and TESTED electrically(circuit) fairly easily .

could be a failing mode actuator

Could be the actuator, could be as simple as the control panel not working properly. Ask around and find a local mechanic in your area that is well established and trusted by his neighbors. In my experience, the local mechanics shop is more honest and much less advantageous when it comes to finding and fixing the actual issue rather than starting with the most expensive option first and working down the list.