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Congress can establish advisory bodies within the legislative branch [1] to grow and maintain technical expertise on a variety of matters. Splitting the current regulatory agencies into enforcement agencies under the executive and advisory bodies under Congress, together with expanding the number of seats in the House [2], would do a lot to improve the balance of power among the branches.

[1] The Congressional Budget Office is an example. (https://www.cbo.gov/)

[2] Laws have to go through a committee process before going to the floor; with more bodies, the committees could handle more work. Expanding the House would also make each seat less of a prize, reducing (but not eliminating) the impulse to gerrymander. Such an expansion would probably need to be accompanied by a serious conversation with the Capitol architect.