Michel saluted an "incredible" season for Girona, but admitted it will be hard for his side to emulate their exploits next term.
The Blanquivermells have enjoyed a campaign to remember in LaLiga, topping the table on several occasions before eventually finishing third and securing Champions League qualification for the first time.
Michel's side capped the season with the biggest win in the club's history, as Artem Dovbyk scored a hat-trick in a 7-0 rout of already relegated Granada at Estadio Municipal de Montilivi.
Their final total of 81 points makes them one of only four teams to reach that tally in LaLiga's current format, along with Real Madrid, Barcelona and Atletico Madrid.
But Michel already has his sights set on next season, during which he knows Girona will have to work hard to repeat their success - especially with several players expected to leave the club.
"I'm feeling a bit down because good things are over," he told reporters. "We achieved something very important. The day-to-day of the season has been incredible.
"The counter resets to zero. We will start to fight for a great season to come, and that's what we will do from tomorrow onwards.
"The dynamics of football tell you that there won't be the same players or the same season. The problem is that many people will be missed.
"We are growing, and we have to continue taking steps forward. We have to lay the first stone, rest, recover, celebrate this great success and, from next week, start planning to put Girona as high as possible."