You could change the speakers but, your missing the sub bass extention, which is where the money starts to ramp up. What car have you go now? Ioniq 5 Ultimate AWD maybe?
Can you change speakers in a scheme car? I know some people who could find awesome speakers to go in stock positions and if it starts off with an amplifier, it’s even better. See if you can get some Audio Frog speakers in there?
I hope your dad’s Ok mate.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark