At one low point in Sochi, he had been leading the Russian Grand Prix when he was ordered to move aside for Hamilton who was fighting for the championship with Sebastian Vettel.
Bottas has already said that he considered quitting Mercedes after that incident, but now he said that he gave the idea more serious thought after the final race of the season.
“Towards the end of ’18, especially when I started to have the support role in the team, I really couldn’t take it, I really struggled. It was not fun, the last four or five races.
“Lewis had been parked there for a long time. As a driver, and a person in the team, he’s the dominant person. So it’s quite difficult to step up and I never could really step up in a way that I wanted alongside Louis, because the team was so welded in, and he’s Lewis so everyone looks up to him.
“The human mind is strange, in a way that sometimes you go into dark places, and you you lose the joy on things, and I just lost the joy of F1 and racing in F1. I was almost angry to F1.
“You should enjoy F1, it’s pretty cool. But it wasn’t that at all. So I had a good break, between the two seasons, and really had to think things through… I had radio silence [with the team] for the whole winter.”
After a holiday in South America and New Year’s celebrations, Bottas was back home when the decision came to him “like a click”.
“I was walking in a Finnish forest, middle of nowhere: sometimes I like to disappear and go for a hike or something for one or two hours in the snow. And then yeah, I was standing still and I could feel this adrenalin and I was like, ‘F**k, yeah, let’s do this’. And then I won the first race.”
That Australian Grand Prix victory brought the famous radio message: “To whom it may concern, f**k you”. It was directed, said Bottas, to the people “trying to push me down”. He went on to win four races that year and ended the season runner-up in the championship.
“Now when I look back at it, it was a great school for me: I learned a lot about myself, sometimes to give me a bit more leash in a way and not to be too hard on myself on some things. But also I just learned so much about everything that I’m really, really glad it happened.”