KeePassXC is a in place alternative for keepass ( they are interchangable )
Sandboxie-Plus only helps with "specific" malware. I recommend you the optional windows sandbox feature. ( Optional Features => "Sandbox" )
For those who dont want to get probably spied on. As Vivaldi is chromium and that is controlled from google. Go use Firefox, or rather Librefox its a real alternative to chromium. ( Its less creepier )
Codium as an de-microsofted Visual Studio Code alternative.