your userbase chart looks great, because it only reflects 2 3/4 years. your graphs are a nice way to construct the appearance of substancial growth.
look at the desktop browser market-share compared with other browsers, barely anything has changed for Opera from 2009 to 2019. Certainly, the numbers reflect a slight DECLINE in market share.
the share was even higher in the year 2009 than it was 2019.