I know the Peak Power Handling is 100 Watt
but if i was to put some more drivers to the amp, or 1 driver what
is Total power of amp can i put a 150watt driver or 200watt in place of the 4.
I'd recommend against any experimentation with this unit unless you are a somewhat qualified electrical (audio) engineer. You can do some serious damage to an amp or the speakers if you don't understand the implications of modifying the load, especially in a downward direction.
At 100 watts 'peak' with a sub-4" woofer this is a modest speaker system at best and probably has very limited potential improvement.