Instead of term limits, I’d much rather they be paid a 99% percentile wage until death, but be banned from accepting any other income or gifts, investing in stocks or owning any sort of business or investment property (again, for life).
It might be better to lower the income to 90th or 50th percentile, so only people that actually wanted the job
would take it.
Ideally, the restrictions would extend to the kids. It would definitely extend to the spouses.
Also, all no campaign donations over $50. Finally, all campaign communications must be publicly archived in realtime, and no more political ads. (The latter is because some politicians now tell different, personalized lies to each constituent, thanks to the internet).
Another possibility is to let anyone volunteer for congress, then pick the winner at random from the pool each term. This worked amazingly well for local positions in some country that tried it. (Government efficiency immediately doubled or something.)