Hamilton dominated F1 in 2019, although Bottas was his closest rival through much of the campaign.
The Finn lost ground in a slight mid-season slump, but recovered his form towards the end of the year, winning in Japan and the United States.
Hamilton's second-placed finish at COTA was enough to officially knock Bottas out of title contention, but the Finn says being able to celebrate the race win helped him keep a positive view on his season as a whole.
"Now it's on the right way," Bottas told Autosport. "I can see a little bit the improvements and gains I've been able to make as a driver and the amount I've been able to learn, within this year and from last year.
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.