Deulofeu scored both goals in Saturday's 2-1 victory at Huddersfield to take his tally for the season to 11.
He said: “It will be the best season if we win the cup and finish seventh in the Premier League.
“I am feeling good and playing striker with free movement and a lot of space. That is the reason I feel good and I can score more goals.
“I played on the wing before and on the wing you have to go back a little bit and play further from the goal. This season is different and I am nearer to the goal.
"I came here to play regularly and play a lot of games. My career is long because this is my sixth year in a top division. Every time, I am travelling one way or another.
“Every player wants to play every minute but sometimes I was in really good big teams and when you are young that is difficult. But I am really happy here, playing regularly, and you can see it on the pitch and that is the reason I am in this form."