Alonso started 2023 with a run of podium finishes and was occasionally the closest challenger to pacesetter Red Bull.
However, in the middle of the season, Aston Martin took some wrong steps in development, and the team slipped down the order before a resurgence late in the year.
Alonso believes that his team won't repeat those mistakes and has addressed them with its new car.
"I'm confident," he said. "If not, I could not maybe sleep for the last two months! But I think we did a lot of experiments and a lot of changes back and forth in terms of understanding the problems and the direction and the paths that we need to follow this year on the car.
"I think we understood a lot of things, and with this year's car we intend to improve some of those weaknesses that we saw in terms of developing the car last year that we maybe got into the wrong direction a few times, and we understood a little bit too late.
"Hopefully we have that knowledge, those difficulties from last year were lessons that we took on board for the '24 car, and we will see the result.
"I think we had a good step forward this winter, maybe not as big as last year, because last year the baseline was very poor. And this year, the baseline was very strong already last year's, which is understandable."
Alonso made clear in what areas he expects to see improvements with the new car relative to the AMR23, which had inherent weaknesses despite its strong form.
Source: Autosport