The Villans travel to Old Trafford to face Manchester United on Monday with three points separating them and the drop zone.
"For me it has been a good season," Guzan told the club's official website. "Do I still think there is room for improvement and areas to get better? For me, 100%.
"The next thing on the list is to make sure we pick up enough points in the next five games [to stay up]. That's the main priority."
Guzan has made 32 appearances in all competitions for Villa so far this season.