Windows Presentation Foundation (WPF) was meant to replace it way back in 2007, and UWP is today's thing, but for non-designers Windows Forms is easier to work with (UWP does not work on Windows 7).
https://www.theregister.co.uk/2017/10/25/microsoft_developer_strategy_after_uwp/
https://www.theregister.co.uk/2017/10/25/microsoft_developer_strategy_after_uwp/