The Scuderia emerged as the nearest challenger to Red Bull at the start of the second ground-effects F1 era and finished 2022 as the championship runner-up.
But it has now dropped behind Mercedes and Aston Martin to fourth in the 2023 constructors' standings ahead of the second part of the campaign.
Alongside this performance drop-off, criticism remains over the team's strategy calls and pitstop execution, as per last year.
With a 312-point deficit to Red Bull ahead of the Dutch Grand Prix this weekend, Maranello boss Vasseur says Ferrari must address "every single pillar of performance".
Speaking to select media before travelling to Zandvoort, Vasseur said: "If you look at the numbers, it's quite difficult to imagine that we could be champion on the team and driver championship [this year].
"But we need to keep the same mindset to try to get the best on everything that we can and not to be focused on the championship.
"We have to improve the package, but we also have to improve what we are doing on track and to try to get the best from the package that we have. It's clear we have to be focused.
"But I don't want to fix a target to say that we have do 'this' or 'this'. As long as we have room for improvement, we have to put some focus on this.
"It's clear that on every single topic and every single pillar of the performance, we have to make a step forward."
Source: Autosport