Ole Gunnar Solskjaer demanded more from his Manchester United players after defying the critics to clinch a Champions League return.
Bruno Fernandes' penalty and a goal from Jesse Lingard sealed third in the Premier League after a 2-0 final-day win at Leicester.
It ended a one-year exile from Europe's top table and left the Foxes having to settle for fifth place and the Europa League.
Jonny Evans was sent off late on against his former club to add to Leicester's woes.
But victory left Solskjaer expecting improvement from United after they were tipped to miss out on the top four at the start of the season.
He said: "All the predictions were sixth or seventh. That's alright. If I'm getting criticised that makes me stronger and believe more in what I'm doing.
"Please don't praise me too much because you can become complacent. That's just the way I'm made.
"I believe in what I do and what I've been doing. We all have different ideas to management and I do it my way. That's the only way I can do it. I have a fantastic staff and the players have bought into this.
"Next season with the Champions League instead of the Europa League will be different.
"We want to move up the league table so we can't take our eye of the league and rest players like in the Europa League, there will be more demands on the players.
"Next season will be even more testing. You have to get used to playing 45 to 50 games for this club every season.
"It's been a massive achievement, they are incredible. We have come so far as a team and we're building a culture. To win the game was massive mentally for them as well."