in 1800 there were 105 Congressmen for about 5,300,000 citizens.
That's about one Congressman for every 50,000 people.
If that ratio was kept we'd have 6,600 Congressmen.
That is not a working system, but neither is the one we have now where each Congressman "represents" 3/4 of a million people.
The experiment of the US has run its course. Time for something different.