Arnason told BBC Devon: "It's been a breath of fresh air being pushed up to midfield and it feels good.
"I started looking at myself as a defender but it is not as fun to play that position because most of the time you're just booting the ball away."
He added: "[In midfield] you get more time getting the ball into feet and trying to play football so it is more fun, and I've been playing better ever since.
"You can get stuck in football when you're down in a hole and you need something to pull you out and that was it for me."
Arnason's move into the centre of Plymouth's formation has coincided with an upturn in form for the Pilgrims, with eight points from the last five games.
The Iceland international said: "We've had a few good results and it feels like, now we've got a bit of momentum going, we might get up there in the play-offs at the end of the season."
Source: BBC Sport
Source: BBC Sport