Term limits seem fine, just make them a reasonable length. Say, three of their full six year terms for a Senator seems fine for example. Or maybe allow states to elect one senator to a fourth term (logically this will always be their senior senator) but never both and no fifth terms. [I'm assuming we'll allow, as for Presidents, an incomplete first term, for senators that might be by election to replace another out of sequence]
A freshman senator might be intimidated by an aide who knows DC like the back of their hand after forty years in the office back room, but when they're back for their second, let alone third term, that old hack doesn't know the first thing about the actual job, that aide isn't in those meetings hashing out a 2am compromise with the White House, and they're not in a town hall back home trying to explain to some fellow who has never left Kentucky why we need to spend so much money on a Navy they've never seen.
Another alternative, which existing American politicians will hate but too bad, is age limits. For example the UK's Supreme Court all have to retire by age 75. I can't imagine a lot of the oldest senators are effective legislators, they'd rather be in bed than get stuff done. So, age them out.
A freshman senator might be intimidated by an aide who knows DC like the back of their hand after forty years in the office back room, but when they're back for their second, let alone third term, that old hack doesn't know the first thing about the actual job, that aide isn't in those meetings hashing out a 2am compromise with the White House, and they're not in a town hall back home trying to explain to some fellow who has never left Kentucky why we need to spend so much money on a Navy they've never seen.
Another alternative, which existing American politicians will hate but too bad, is age limits. For example the UK's Supreme Court all have to retire by age 75. I can't imagine a lot of the oldest senators are effective legislators, they'd rather be in bed than get stuff done. So, age them out.