Browsing around, and of course checking the standard sudo -l got me nowhere. But one file was interesting /var/www/html/app.py since it is writeable by nathan.
But after a few attempts I decided to let it go and go back to basic enumeration. Uploaded the suid3num script it found nothing out of the ordinary. Then pushed linpeas onto the box and I found something quite exciting, especially with the box name in mind.