Kubica was known to maintain discussions to simply take up a simulator position together with Ferrari after the departure of its reserve drivers Antonio Giovinazzi and Daniil Kvyat to Sauber and Toro Rosso respectively.
“I experienced some opportunity which I think was very intriguing and it wasn’t easy to say no.
“At the conclusion, I am a racing driver – although I have not been rushing for a long very long time – and also this rushing mindset has won out.
“I am happy to have decided since it’s a major challenge.”
Earlier this season Kubica affirmed a long-term rumour he had been expected to partner Fernando Alonso at Ferrari at 2012, until the 2011 rally crash which left him with life-threatening traumas and disrupted his livelihood.
His return to the grid with Williams at 2019 will indicate the first time he’s contested a grand-prix as the 2010 season finale.
But Kubica believes he is prepared because of his F1 come back and also to start over again at the next phase of his livelihood.
“It is difficult to become an F1 driver: it’s not easy to convince people you can perform it and establish your self at an F1 paddock,” said Kubica.
“you need to get a lot of drive to accomplish it because I moved through this 1-2 years ago, as well as in the endI said I believe I have the energy to complete it .
“I am not stressed or scared of the challenge and I believe I will make it work. I’ve got a wonderful opportunity and it’s a happy ending to the long journey I have been on.”
He confessed that adjusting by the development position to being a race driver next year would require some work.
“When I am driving the car I have to bear in mind that I must offer excellent information and feedback, so I am ready to deliver decent pace and perhaps not risk anything,” said Kubica.
“I have to change this approach a bit because now I must work for a team, as I had been, but also for myself personally.
“I want to focus on unique things which might be of use when I am rushing. It’s a tiny different strategy.”