Mostly there is a Bitcoin mixer styling, altcoin are used for speculative purposes so you will not find a real altcoin mixer.
this list have most famous mixing services that are still working until today^[1].
You may need to use Binance to convert between Bitcoin and some alcoins without KYC but your identity may be tracked.

[1] https://bitcointalk.org/index.php?topic=2827109.0