No advise on trying to mix the BTC?
Discussion
check out joinmarket or joinstr.xyz
but its really difficult to evaluate what privacy guarantees you're getting
or you could swap into LN or Monero and swap back out to a different wallet.
which is vulnerable to timing and amount analysis, so you have to do random amounts at random times....
it depends what your threat model is and who you are trying to remain private from 😕