check through the hotkeys of your current window manager – you won’t get the full dynamic features of a tiling window manager, but most of them have keys for snapping windows to top-half, bottom-half, left-half, right-half (as well as sometimes offering by quarter as well)
the explanation I got a long time ago is that when something gets so bad that nothing you can do will change it is the time you sit back, crack a beer, and admit “no worries”
I think there might be some aspects of this in Material Shell extension for Gnome – but it still maintains the discrete workspaces rather than joining everything into one seamless space