How to update database fields using controller Laravel - No error message

I am going round in circles trying to update data to the database, I finally have got rid of all the errors so now its correctly redirects with no error yet it isnt updating on the site or on the database.

Any help would be greatly appreciated, thanks!

web.php

Route::put('/my-saved-routes/{myroute_id}', 'MyroutesController@update');

MyroutesController.php

public function update(Request $request, $id)
{    
     $Myroutes = Myroutes::find($id);
     $Myroutes->start = $request->input('start');
     $Myroutes->end = $request->input('end');
     $Myroutes->waypoints = $request->input('waypoints');

     $Myroutes->save();

     return redirect('/my-saved-routes');
}

show.blade.php

<div class="col-md-4">
                            <h2>Route </h2>                               
                            <form method="put" action="/my-saved-routes">
                                
                                
                                <input type="hidden" name="_method" value="PUT" />
                                <div class="form-group">
                                    <label>Start Point</label>
                                    <input type="text" id="start" name="start" class="form-control" value="" required/>
                                </div>

                                <div class="form-group">
                                    <label>End Point</label>
                                    <input type="text" id="end" name="end" class="form-control" value="" required/>
                                </div>

                                <div>
                                <label for="mode">Mode of Travel</label>
                                    <select id="mode" class="form-control" onchange="calculateAndDisplayRoute();">
                                      <option value="DRIVING" name="driving">Driving</option>
                                      <option value="WALKING" name="walking">Walking</option>
                                      <option value="BICYCLING" name="cycling">Cycling</option>
                                      <option value="TRANSIT" name="public-transport">Public Transport</option>
                                    </select>
                                </div>

                                <p>Note: Public Transport is only available for start and end points.</p>


                                <div id="dynamicInput" class="form-group">
                                    <label>Additional Destinations</label>
                                    <input type="text" name="waypoints" class="form-control" autocomplete="on" value="">
                                </div>

                                <input type="button" class="btn btn-secondary" value="+" onClick="addInput('dynamicInput');" style="padding:0 10px;">               
                                </br></br>
                                <input type="button" id="calc-route" style="color:#2b2b2b" class="btn btn-light" value="Calculate Route"/>

                                <input type="submit" id="update-route" class="btn btn-success" value="Update"/>
                                <input type="button" class="btn btn-danger" value="Delete"/>

                            </form> <!-- end of form -->    

Myroutes.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

use Illuminate\Http\Request;

class Myroutes extends Model
{
    protected $fillable = [
        'myroute_id',
        'user_id',
        'start',
        'end',
        'waypoints'
    ];

    protected $primaryKey = 'myroute_id';

}

via Chebli Mohamed