Installed Manjaro XFCE and RAM usage after boot was around 500 MB. So, I unistalled a lot of unnecessary packages like xfce4-dict, etc. And installed Qtile, a window manager. Now RAM usage after boot is 185 MB which, to me, is crazy. Can I go even lower than this? 
Sure, uninstall more what’s currently running in the background and isn’t useful to either you or the system.