The Hammers suffered a poor start to the campaign in what is their first season at the London Stadium, losing five of their opening six Premier League games.
Since the beginning of December, however, West Ham have lost just three of their last 12 games in the top-flight to rise into ninth place in the league standings.
Despite the sheer amount of pressure he was under in the first half of the season, Bilic says he wouldn't change West Ham's difficult first six months in Stratford because it taught his team a lot about their own strengths.
"I consider this season as a great one," Bilic told West Ham's official website.
"For me individually, and for the team, and for the club, because this season we experienced some negative things, some positive things, but mainly a lot of new things.
"I wouldn’t change it. I would change September and October. But after that, when you’ve made it and you get out of that, the experience is priceless and you benefit from it in the future.
"I wouldn’t swap when I was under pressure or the team was under pressure. I wouldn’t swap it for a steady season."
When then asked which game was the turning point for the Hammers, Bilic replied: "It isn’t a turning point that has made the difference.
"We can talk about the game against Crystal Palace away in October, we can talk about the two wins we had at home against Burnley and Hull in the space of three days – two 1-0 wins, two penalties.
"We can talk about that period when we had four big games against Tottenham, Manchester United, Arsenal and Liverpool, and got two points away at United and Liverpool.
"But the reason we have turned things around is that we didn’t stop believing.
"We continued to fight and knew that the only way that we were going to get out was, basically, by sticking together and working hard. And that is the key."