If you don't know anything kindly shut the fucck off. I explained that the free hosting was to verify issues before finally going live on premium. Stop being unnecessarily rude and condescending to strangers MF.
As for the question above, I have gotten a solution. Anyone with similar issue can use this code
// get all posts
$posts = Post::all();
// loop through all posts
foreach ($posts as $post) {
// convert the title into a slug and save it to the slug field
$post->slug = Str::slug($post->title);
// save the post
$post->save();
}