On both our Production and our Development server we have a licence from Plesk. This helps us to manage our servers with tools for our clients to easily manage their own sites.
UptimeRobot notifies us immediately if one of the sites we manage is down or if a certificate is no longer valid. This allows us to respond immediately and that is how we keep the downtime to a minimum.
We're using G-Suite for Nonprofits the BeTo Foundation and for our clients we help with the application and setup.
We're using Office365 from Microsoft and for our clients we can setup Outlook, Office licenses (for the board), and Teams. We can also help with other Microsoft services.