Monero, the crypto, is untraceable. Any user error is unrelated to that.

using the same Monero wallet for multiple transactions

You can use the same Monero wallet as many times as you want. I’m not sure where you got this idea that you can’t use the same wallet more than once, but it’s simply not true.

connecting your Monero wallet to another non-private wallet, and leaking metadata outside of the block chain

I honestly don’t know what you are even talking about? There are no “non-private” Monero wallets. It’s not possible. And how does one “leak metadata outside of the [Monero] blockchain”?

Interesting link. Hmm you know, let me look up who this “TRM Labs” company actually is…

Oh wait that’s weird, they seem to be directly aligned with the goals of the Trump administration. Huh.

Just a coincidence that you used them as your source I’m sure. I’m certain you have other sources corroborating those claims and have no problem posting them here.