I've beaten game too many times main quest is boring i don't really feel like doing DLC's due to no radio (which really is like 20% of the game)
id go exploring but i don't feel my character is ready for the majority of the "dungeons?" out there
If you have beaten the game numerous times as you say then you shouldn't be asking where to go exploring. And there really aren't "dungeons" in this game. At level 6, you can do a lot depending on your major skills and playing experience. A tip though, the really dangerous part of this game is the DC area, as that's where the Super Mutants are. So other than there, you should be fine. If you find the game to be
too challenging try turning the difficulty down. You can still get to the level cap and have an enjoyable experience on "Very Easy", trust me.
Hope this helped.