KDE's 2019 yearly report is out. Includes a comprehensive list of activities, a breakdown of what changed and the goals we set, and the all-important financial report ????.
https://ev.kde.org/reports/ev-2019/
You can support KDE activities throughout the year by becoming a supporting member of the KDE e.V.: https://relate.kde.org
Or by making a one-time donation ➡️ https://kde.org/community/donations/