Retain values when switching view controllers

Hello,
My app has a settings page where the user can toggle buttons etc and I would like those values to carry over to the next screen / view controller file so that I can display different things depending on what the user inputted. I have tried everything from state and binding variables to cocoa touch class with a segue that can modify the variables of the destination view controller, but I always get errors. I'm not sure if it's because I'm using a more recent version of swift? But here is my code and some of the things I've tried:

Settings page:

Code Block 
import UIKit
class SessionSetupViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
    
    //@State var visualBool = true
    
    //var feedbackAmt: String = "String"
    //var feedbackAmt = String()
    @IBAction func VisualToggle(_ sender: Any) {
    }
    
    @IBAction func AuditoryToggle(_ sender: Any) {
    }
    
    @IBOutlet weak var PickerLabel: UILabel!
    @IBOutlet weak var FeedbkAmtPicker: UIPickerView!
    
    let amounts = ["Low", "Medium", "High"]
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return amounts[row]
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return amounts.count
    }
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        PickerLabel.text = amounts[row]
        //feedbackAmt = amounts[row]
        //let feedbackAmt = amounts[row]
    }
    
    @IBAction func BeginButtonPressed(_ sender: Any) {
        self.performSegue(withIdentifier: "BeginSegue", sender: self)
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
   // override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     //   if segue.identifier == "BeginSegue" {
       //     let destinationController = segue.destination as! BluetoothViewController
         //   destinationController.feedbackAmt = PickerLabel.text!
      //  }
            
   // }
}

And then the destination view controller:

Code Block 
import UIKit
import CoreBluetooth
//local central device object
class BluetoothViewController: UIViewController, CBPeripheralDelegate, CBCentralManagerDelegate {
    //properties
    private var centralManager: CBCentralManager!
    private var peripheral: CBPeripheral!
    
    var feedbackAmt = String() // from session setup view controller
    
    //var sessionSetupViewController: SessionSetupViewController?
    
    //let bluetoothViewController = BluetoothViewController()
    //let sessionSetupViewController = SessionSetupViewController()
    
    //bluetoothViewController.sessionSetupViewController = sessionSetupViewController
    
    //sessionSetupViewControler?.feedbackAmt
    
    //label to display stage of gait cycle
    @IBOutlet weak var StateLabel: UILabel!
    
    //characteristics
    private var StateVar: CBCharacteristic?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        centralManager = CBCentralManager(delegate: self, queue: nil)
        //StateLabel.text = "\(ArduinoPeripheral.ArduinoCharacteristicUUID)"
        //StateLabel.text = "\(SessionSetupViewController.feedbackAmt)"
        //StateLabel.text = feedbackAmt
    }
// core bluetooth functions...

Please let me know if there is another way I can pass those values/settings to the next view controller. Thanks!