O’Grady joined Forest on a season-long loan deal from Championship rivals Brighton & Hove Albion in the summer transfer window.
“I joined and started really well, then there was a dip for myself and a dip for the team,” the 29-year-old told Forest’s official website.
“It was my dream move and I was desperate to try and make it work. I had to come to terms with that, reset myself, and that’s what we’ve done as a team and that’s what I’ve done personally.”
O’Grady played an important role in Forest’s return to winning ways in the Championship at the weekend.
The former Sheffield Wednesday man scored a goal and created another, as Dougie Freedman’s side defeated Reading 3-1 at the City Ground on Saturday afternoon.
The striker took five shots, had a pass accuracy of 59%, created two chances, put in two crosses, attempted two dribbles, won 67% of his tackles and 67% of his headers, and made one block.
In 10 Championship appearances so far this season, O’Grady has scored one goal and created eight chances.
The former Leicester City striker has a pass accuracy of 60% and a pass accuracy of 71%, and has won 52 headers, nine dribbles and three tackles.