The Scotland midfielder moved to the DW last summer from Hamilton.
McArthur said: "At the start of the season I was a wee touch thinking 'look where I am now'.
"Now I realise where I am and I'm just trying to do as well as I can where I am.
"I want to play more games. I played in 25 this season but only started a handful.
"Next season I want to play more and start more. I'll just keep training hard and hopefully become a better player again."