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Redis/memcached configuration is wrong or is being manipulated by some other piece of code in the system at the same time. In the case of the database driver, your DB connection might be wrong, or the sessions table might not exist or wrongly configured (the wrong configuration part was confirmed to be an issue as per the comment by Qadir). Probably file-based sessions might not work because of the permission issues with the /storage directory (a quick googling will fetch you the solution), also remember putting 777 for the directory is never the solution. If your form works after switching the session driver, then something wrong is with that particular driver, try to fix the error from there.
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Supported Session drivers in Laravel 5, Laravel 6 and Laravel 7 (Doc Link) env file, the supported drivers are given below
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Maybe you can try switching your session driver/software from your. The csrf token verification is directly involved with your session, So you might want to check whether your session driver is working or not, such as an incorrectly configured Redis might cause an issue. Then the other area to check is the session. In the form the blade directive is already added, which should be fine as well. The Session Expired or 419 Page Expired error message in Laravel comes up because somewhere your csrf token verification fails which means the App\Http\Middleware\Verif圜srfToken::class middleware is already turned on. Before reading below make sure you have or in your form
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