Your options are limited. Bittrex is a favorable option with many; but, as noted...doors closed to new accounts.
Many use Poloniex with mixed reviews. Blocktrades is popular with many; but, to buy BTC you have to first get a BTC Wallet, i.e. Coinbase.
OpenLedger is an option; but, until it has more consistent usage (down for maintenance for weeks) I can't recommend this one either.
Truthfully, and I could be wrong; but, you're pretty much locked in to Powering Up, Powering Down; or cashing out SBD for Steem.
I hope this helps.
Peace.
Thank you! It def helps! It also reaffirms what I’ve been reading on my own.
Just clarify, here you mean through the Steemit market or by burning it?
Yes, this is what I meant. If you convert the SBD into STEEM it remains at-the-ready as a buy and sell currency.
Peace.
Cheers!
✌!