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I highly suspect the commands and paths you have mentioned.

1. opt/ros/humble/setup.bash should be /opt/ros/humble/setup.bash
2. . install/setup.bash should be install/local_setup.bash

Finally, please make sure that you can see your workspace by executing printenv | grep PATH as shown below:

$ printenv | grep PATH

AMENT_PREFIX_PATH=/home/ravi/ros2_ws/install/examples_rclpy_minimal_publisher:/opt/ros/galactic

COLCON_PREFIX_PATH=/home/ravi/ros2_ws/install

PYTHONPATH=/home/ravi/ros2_ws/install/examples_rclpy_minimal_publisher/lib/python3.8/site-packages:/opt/ros/galactic/lib/python3.8/site-packages

LD_LIBRARY_PATH=/opt/ros/galactic/opt/yaml_cpp_vendor/lib:/opt/ros/galactic/opt/rviz_ogre_vendor/lib:/opt/ros/galactic/lib/x86_64-linux-gnu:/opt/ros/galactic/lib::/usr/local/cuda-11.1/lib64

PATH=/opt/ros/galactic/bin:/home/ravi/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/cuda-11.1/bin:/home/ravi/.local/bin

This is how my workspace is structured:

.
├── Desktop
├── Documents
├── Downloads
├── Music
├── Pictures
├── Public
├── ros2_ws
│   ├── build
│   ├── install
│   ├── log
│   └── src
│       └── minimal_publisher
├── Templates
└── Videos