Bitcoin is very likely to take one more big dip in the near future before it can level out. You will want to wait until that happens before investing. And if at all possible try to time when you buy your steem when BTC is around 6k in value.
Otherwise you risk bleeding out money for a bit until things level out.
SBD is not intended to go up in value, the fact that it is going up in value is a bit of a fluke. Be very careful about expecting SBD to go back up. While it probably will short term it is expected that it will be tethered to 1 USD worth of steem down the road.