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As exch is shutting down (a possible competitor) , wouldn't it be a good time to add XMR to your coins? Maybe even Eth.
Some people who want more privacy and also want to swap coins would bemefit and use your service (i certainly would).
As you already support dash, adding one or 2 more coins shouldn't be too much trouble
Monero is already a private cryptocurrency; adding it to the service wouldn't be much help since it's already private, even if some have already done so. There's also a major limitation with Monero: it's increasingly being removed from exchanges

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Even if you switch from Bitcoin to Monero to Bitcoin, the fees will be high, and you'd have to do more than five times: Bitcoin > Monero > Bitcoin > Monero > Bitcoin for true anonymity with completely random outputs, or Bitcoin > Monero > Bitcoin.
It's true that with the proliferation of tools and the growth of cryptocurrencies, users are no longer looking to mix their Bitcoins, but increasingly to mix their altcoins.
We also know that users today are looking to obtain clean, unrelated coins.