Buy an actual graphics card.
Well... I mean not everyone can casually shell out $500 for a graphics card, $200 for a used motherboard, $50 for a new PSU, and a new case to be able to fit it because the proprietary one is shaped weirdly. I have everything except the motherboard and I almost have enough money so I should get it but not everyone has that much.
Well if you can't pay you can't play... gaming isn't cheap.
But you don't need a high end PC, why would you buy a used 200€ motherboard when a new 100€ motherboard (with good features) is all you need and a good graphics card like the RX 6600 cost only 230€.