Bruno Senna believes he is still in his Formula 1 learning curve and would be much more competitive with a second full season with a competitive team in 2012.
The Brazilian has been overshadowed by his Spanish Grand Prix-winning team-mate Pastor Maldonado at Williams this year.
Qualifying has been a particular issue for Senna, who now faces an uncertain future, particularly given Williams test driver Valtteri Bottas's strong Friday form. The Finn has taken Senna's car for Friday morning practice at most 2012 races.
Senna started his F1 career with HRT in 2010, contesting 18 of the 19 races with the backmarker team. He then replaced Nick Heidfeld at Renault for the final eight rounds of the 2011 season before signing for Williams this year.
"It's been a challenging season with lots of learning, some results and some tough races as well," he said.
"Considering it's my first year in F1 with the small handicap of not doing Friday, in the end most of my races were very strong but starting from a different position to where I should be starting has made me score less points.
"At the end of the day it is learning. You do better at the second attempt so for sure there will be a lot of improvement to be done next year."
He added that he currently had no doubt whether he would retain his Williams seat.
"It is undecided," Senna admitted.
"I think we have to wait until after the season to see what is going to happen, so let's see if it comes in the right way and we can be in a competitive car next year."