Great news for all fans of Fallout 4 : Bethesda has stated through a message on Tweets that play continues after the main campaign and there will be a Level Cap , so you can level up until you want to, without any limit. We leave you to tweet.

To our fans who've asked: 4 Fallout doesn't end when the main story is over and there is no level cap. You can keep playing and leveling.

— BethesdaGameStudios (@BethesdaStudios) August 6, 2015