Using below command to set short cut key Alt+Shift for switching Keyboard Languages (For my Ubuntu 24.04.3 LTS)
$ gsettings set org.gnome.desktop.wm.keybindin
$ gsettings set org.gnome.desktop.wm.keybindin
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Switching Languages Keyboard Setup <Alt+Shift>
English
日本語
ภาษาไทย