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.
"It is a very nice feeling to see that actually the hard work is at some point paying off.
"When I look at the season, of course, when Lewis secured the title, the initial feeling was disappointment, because I knew it's game over again, and I kind of failed in my goal.
"But very quickly, the race helped as well, to keep the good feeling.
"I look at this season in a very positive way, because of all the learning I've been able to do."
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