Asking suggestion for 2.1 amplifier method

Hi! I have a mobile 2.1 PA speaker system which i used with a cheap chineese TAS5630 2.1 board. It was not not the best but it served me for almost 2 years, but it got faulty recently. I'm trying to research about the topic but I could use your opinions and suggestions.

I need for the stereo part at least 2 * 100-200 Watt and for the sub ~300 Watt @ 8 ohm(the very minimum). Furthermore for the sub it would need to be have a low pass filter.

I thought about the "plate amplifier design" too which is mostly used for the mobile 2.1 PA setups you can get.
Are there any shops for oem/diy with a selection of this plate amplifiers in europe ?

Like this for eg🙁bit overkill and it's in the US, but this kinda setupp)
B-52 Matrix-1500 BBE 3-Ch Plate Amplifier 1200W


The original board I've used:
UNISIAN TAS5630 2.1 Audio Amplifier Board 2X150W+300W Digtial 2.1 channels Class D High power Amplifier for Home theater system|Amplifier| - AliExpress

What would you recommend me to do ?
 
I have PSU, DSP, and TPA3255 2.1 amp
 

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