When one of two parties has the single-minded goal of establishing a dictatorship and enough electoral support to regularly win elections, I’m not sure you can design a system of government that can withstand it, short of making it completely dysfunctional by not giving the executive the ability to actually function.
Even if the Democrats win back the presidency and use the power to try and put in place guardrails and re-establish a republic, the foundation is still rotten and would likely be quickly eroded again once there was a Republican president. Sulla tried this 2000 years ago and it failed within a generation.
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and the CEO has properly cowed all members of the board whose votes actually count, so he can do whatever he wants
the best case scenario is that this can begin to be repaired starting in 2027, but that's looking less and less likely