One of the most refreshing design trends of 2019 is a shift to more vintage typography styles.
More serif typefaces, rounded slabs and text elements that seem to have an older feel. These vintage styles all seem to have bolder, thinker lines than some of the thinner sans serifs that have been popular in the last few years.
Even some well-known brands, such as Mailchimp (above) have shifted to this vintage typography style.
The biggest contributing factor to this design trend is better screen resolutions across all devices. It was once thought that sans serifs were the most readable on screens, but thanks to high def and high-res understanding serifs is not an issue.