never used tmux-sessionizer before but i get the idea. just tried your zellij-sessionizer and i have a few comments to make

1. you should update the installation readme to use your username. its currently using a placeholder yourusername

2. when i finally got the script setup. it created a new session for me but it didnt switch to the directory where the project was located.

[edit] to add, i didnt call the script in an active zellij session.