A 5-2 defeat to Merseyside rivals Liverpool on December 4 left Everton in the Premier League relegation zone and facing the realistic prospect of a fight for top-flight survival.
The loss at Anfield proved to be the final straw for Marco Silva, who has flattered to deceive with Watford and now Everton following a spell at Hull City that he was largely praised for, despite suffering relegation.
Ten games on, and with a helping hand from interim boss Duncan Ferguson along the way, Carlo Ancelotti has ninth-placed Everton eyeing Europa League football next season.
The Toffees have lost one of their past 10 league games - seven of those under Ancelotti - compared to eight defeats in Silva's final 11 matches.
Indeed, only Merseyside rivals Liverpool have won more points over that time than Everton's 19, suggesting the Italian coach is well on course to transforming their fortunes.
Ahead of Saturday's visit of Crystal Palace, a side they are unbeaten against in 10 league meetings, we used Opta data to look at what exactly has changed under Ancelotti.
CALVERT-LEWIN AND RICHARLISON LEADING THE WAY
Everton have scored in all seven league games during Ancelotti's short time at the club, netting 11 times in total at an average of 1.6 goals per game.
That is in comparison to 20 goals in 18 games prior to the veteran manager's arrival - 1.1 per match - which is a clear improvement.
Dominic Calvert-Lewin has been responsible for five of those 11 goals and Richarlison - absent for a couple of games with a knee injury - has also chipped in with two.
Fellow attacker Moise Kean finally got off the mark in the 2-2 draw with Newcastle United, while Theo Walcott scored for the first time this season last time out.
Many aspects of the Toffees' play has changed over the past six weeks, arguably none more so than the way they try to create opportunities for their attacking players.
Everton's build-up attacks - an open play sequence containing 10 or more passes that either ends in a shot or at least one touch in the box - has increased from 1.2 per game to 2.3.
Direct attacks have dropped from 1.6 to 1.4 each match by comparison, meaning Ancelotti has got his side passing the ball more and - even more importantly - doing something with it at the end of attacking moves.
MORE CHANCES BEING CREATED
Everton used a back five in Silva's final two games - defeats to Leicester City and Liverpool - but have since reverted to a 4-4-2, spearheaded by the ever-present Calvert-Lewin.
Despite the shift in system and more emphasis on passing the ball around the pitch, there is still a reliance on set-pieces, counter-attacks and crosses into the box for their goals.
That was highlighted in the dramatic win at Watford last weekend when Yerry Mina twice scored from a corner and Walcott rounded off a swift counter late on.
Many Evertonians will argue their side still lack a creator, which could be down to Ancelotti's reluctance to tweak his formation slightly.
But as the Opta data shows, Everton are now creating significantly more big chances - from an average of 1.9 per game before Ancelotti to 2.9 in the seven games since.
The Merseyside club's expected goals figure has also risen from 1.3 to 1.9 in seven games under the Italian, so improvements have been made in that regard as well.
LESS FOCUS ON PRESSING
If Ancelotti has managed to get more out of his attack, the same is true at the opposite end of the field. In fact, it could be argued he has improved both aspects in equal measure.
In perfect symmetry to the average goals-for stat, Everton have conceded 1.1 per game under Ancelotti compared to 1.6 before - a large number of those coming via set-pieces.
Everton are tackling less and intercepting at an almost identical rate, yet they have two clean sheets in seven games, compared to two in their previous 10 outings.
One tweak that could explain this relative improvement is the number of pressed sequences, defined as an opposition move of three or fewer passes that ends within 40 metres of their own goal. That figure stood at 15.4 under Silva and Ferguson but has since dropped to 11.9.
Combine that with the decline in high turnovers and it seems clear Ancelotti has told his players to focus less on pressing and more on keeping their shape.
The performances may have been mixed on the face of it, but Ancelotti is slowly transforming this Everton side and could have them aiming higher than the Europa League with more time and investment.