Laravel filter users based on their attributes, with a dropdown list?

Question

So I have a list of users that I am showing on a page and they have attributes in a foreign table, linked via the user_id. What I want to do is sort by the users based on what is clicked in a dropdown list. However, I'm not sure how to do this, at the moment I am getting it where the sorting of these lists is happening in the select list, for example for the attribute age, in the dropdown list it is showing up as , [{"id":2,"user_id":21},{"id":3,"user_id":24}, {"id":4,"user_id":25}], for Country and gradelevel it looks like this as well. What I want is for the each category to be displayed in a drop downlist, like Age, Country, GradeLevel etc.

This is what the method to list all the users looks like:

 public function render()
    {
        $users = User::where('id', '!=', Auth::user()->id)->limit(14)->latest()->get();

        $gradeLevel= Attribute::orderBy('GradeLevel','desc')->select('id','user_id')->get();

        $age= Attribute::orderBy('Age','desc')->select('id','user_id')->get();
        $country= Attribute::orderBy('Country','desc')->select('id','user_id')->get();
        $data=[
            'gradeLevel' =>$gradeLevel,
            'age' =>$age,
            'country' =>$country

        ];


        return view('livewire.add-friend',
       compact('users', 'data'));
    }

This is what the view looks like:

<form>

        <label for="data">Role</label>
        <select>

        @foreach($data as $dat)
            <option value="{{ $dat }}"> {{ $dat }} </option>
            @endforeach

        </select>

    </form>