GUI , Desktop or Window Manager on Windows Subsystem Linux(WSL)

sudo apt install xfce4

cd ~

nano .bashrc

export DISPLAY=:0.0

xfce4-session

if pgrep -x "gedit" > /dev/null
then
    echo "Running"
else
    xfce4-session
fi

if ! pgrep -x "xfce4-session" > /dev/null
then
    xfce4-session
fi

P.S. Running command xfce4-session should be avoided. One should run startxfce4 instead.