How can I increase the A of the allowable current of the PCB when proceeding with the artwork?
Wider tracks, thicker copper = more money 
There is also the possibility of more pcb layers. That also costs more money. But: How much current are you conducting? How far is the current going? How much I*R voltage drop can you tolerate? How much heat can you tolerate?
There are also some commercial busbars available. If you want to be cheap, you might be able to clear some solder mask and lay down one or more bare “bus bar wires” such as AWG20 or 0.75 mm.
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2 oz copper is cheap enough, roughly halving track width from default 1 oz.
The trick is finding connectors that can actually get these high current on and off your PCB
I don’t recommend using inner layers for high currents, the rating is very low due to poor cooling
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