Laravel : Create Button returns the same view but blank and does not create any record - laravel

Question

I am new to laravel and I am working on creating a CMS. I have created a view to create posts but after I input data and click create to submit, page refreshes and shows the same view but with no input and no record created, when it should show a flash message and return the posts index view.
Here is my VIEW HTML:
#section('content')
<div class="card card-default">
<div class="card-header">
{{ isset($post) ? 'Edit Post' : 'Create Post' }}
</div>
<div class="card-body">
<form action="{{ isset($post) ? route('posts.update', $post->id) : route('posts.store') }}" method="POST" enctype="multipart/form-data">
#csrf
#if (isset($post))
#Method('PUT')
#endif
<div class="form-group">
<label for="title">Title</label>
<input type="text" class="form-control" name="title" id="title" value="{{isset($post) ? $post->title : ""}}">
</div>
<div class="form-group">
<label for="description">Description</label>
<textarea name="description" id="description" cols="5" rows="3" class="form-control">{{isset($post) ? $post->description : ""}}</textarea>
</div>
<div class="form-group">
<label for="content">Content</label>
<input id="content" type="hidden" name="content" value="{{isset($post) ? $post->content : ""}}">
<trix-editor input="content"></trix-editor>
</div>
<div class="form-group">
<label for="published_at">Published at</label>
<input type="text" class="form-control" name="published_at" id="published_at" value="{{isset($post) ? $post->published_at : ""}}">
</div>
#if (isset($post))
<div class="form-group">
<img src="{{ asset('/storage/'.$post->image) }}" alt="" style="width: 100%">
</div>
#endif
<div class="form-group">
<label for="category">Category</label>
<select name="category" id="category" class="form-control">
#foreach($categories as $category)
<option value="{{$category->id}}">{{$category->title}}</option>
#endforeach
</select>
</div>
<div class="form-group">
<label for="image">Image</label>
<input type="file" class="form-control" name="image" id="image">
</div>
<div class="form-group">
<button type="submit" class="btn btn-success">
{{ isset($post) ? 'Update Post' : 'Create Post' }}
</button>
</div>
</form>
</div>
</div>
#endsection
Here is METHOD:
public function store(CreatePostRequest $request)
{
$image = $request->image->store('posts');
Post::create([
'title'=>$request->title,
'description'=>$request->description,
'image'=>$image,
'content'=>$request->content,
'published_at' => $request->published_at,
'category_id' => $request->category
]);
session()->flash('success', 'Post Created Successfully');
return redirect(route('posts.index'));
}
What am I doing wrong?
Thanks,