New Graphics Card for Tower Plus

I have a Dell Tower Plus EBT2250 that I purchased new in March with a 1000W power supply and a RTX 4060 Ti graphics card. I would like to upgrade to a new RTX 5070 Ti graphics card that I just bought. It fits fine and I used the 2X 8 pin power connectors to the 3x 8 pin to 12+4 connector for the card, but with 2 power connectors it does not supply a video signal and just shows a red light by the 12+4 connector. According to the web, it means it does not have enough power to function. Is there any workaround to use my new graphics card in this machine, or is it a lost cause?