Good macro tool for simulated keyboard input

I work in support and constantly need to write a greeting, signature, and solutions to common problems for correspondence with customers. I have been using autokey-gtk package which works okay. It can be clunky at times and requires me to stop and start it constantly. Ideally what im looking for is alternatives to autkey-gtk to get a systemwide method to create macros. I’m running silverblue so flatpak would be ideal but not required and it would need to work on wayland.

An example is typing: ;;/ will trigger my email greeting to be inserted.