A large part of why the government has slowly accumulated these powers is because Congress has been abdicating its power to the President under both Republican and Democratic administrations since the early 1900s.

The first change I would make with a majority in Congress is to change apportionment so that there is 1 representative per 50,000 people. All it needs is a simple majority, and it would neuter the rural-area advantage in the electoral college while also forcing the legislature to streamline its processes.

Texas will undoubtably try to gerrymander itself into a pretzel, but it's not nearly as easy to draw 582 stable districts that produce a huge Republican advantage - a minor demographic shift could easily lead to a backfiring blowout at the polls. With 6,835 seats in the House, Congress would be forced to streamline its procedures (goodbye, filibuster and reconciliation) and it would be significantly harder for the executive branch to ignore public disapproval.

Of course, this represents a ~15x dilution in the power of each current representative (who would then have to run in a new district) so I'm skeptical. Hopefully enough Democrats have woken up and realized that the country won't survive if it keeps going on like this and deep reforms are needed.