There is no way any solution does not require spending more money, and that money will eventually be paid by the rate payers.
By having a capacity market, in addition to the energy delivered market, the solar, wind and other non-dispatchable cannot bid, as they have no way to guarantee delivery. It only rewards those that can delivery on demand as needed.
ERCOT does not have the authority to require what you demand. The failure is with the legislature setting the rules. And the legislature still has not fixed this problem, but only did cosmetic, pretend to fix, stuff as far as I can tell.
Go back to past press releases by Ercot like during 2020.
It celebrates the strength of adding capacity to the grid, mostly from wind and solar.
It states this added capacity will add power reserve margin to cushion the demand expected from the power grid.
No where does it question the reliability of that capacity addition and, in fact, I cannot find even the term "Reliability" used in any of its press releases.
That of course is its main function Electric RELIABILITY Council of Texas.
If it did not have the power to increase reliability, then it should have notified the PUC and the Texas legislature of that fact, and made appropriate suggestions whether to weatherize, add storage for renewables, add reliable nuclear or coal power generation, etc..
It underwhelmed in that primary mission.