Kmail suite for mails, cloud... (Switzerland ) they have a free plan (15GO for the cloud, and the cheapest paid plan is 2e/month for 1TO (20e/year ).
Threema for discussions (Switzerland) . the application is 5e, definitv not cheap for an app, but it is a one time paiement.
Swisscows (Switzerland), mullvad Leta (Sweden) as search engine.
=> they do not use their own index system but brave or google (you can choose for mullvad)
All those options are Europeans and have strong privacy policies.