session

Instead of

@if(session('error'))
<div class="alert alert-danger">
{{session('error')}}
</div>
@elseif(session('success'))
<div class="alert alert-success">
{{session('success')}}
</div>
@endif

Do like this

 @foreach($errors->all() as $error)
 <p class="alert alert-danger">{{ $error }}</p>
 @endforeach

 @if(session('status'))
 <div class="alert alert-success">
 {{ session('status') }}
 </div>
 @endif

Or

<div class="alert alert-danger">
  <ul>
  @foreach($errors->all() as $error)
  <li>{{$error}}</li>
  @endforeach
  </ul>  
</div>

In controller

return redirect()->back()->with('status','Process is successfully done!');