You should jump straight to geometric algebra. It's actually simple there. Quaternions and Complex Numbers are about just some not so special multivectors.

Here are 2 45mn videos you'll not regret:

https://youtu.be/htYh-Tq7ZBI?si=qi9HfU40qKcc_HNc

https://youtu.be/60z_hpEAtD8?si=1M3dDAh7vPjx2Q8Y