It will be very difficult to dump the market further(it is possible, but it will be very difficult and dangerous), because the miners are already working at a loss on some coins, like ethereum. Bitcoin almost fell to mining cost price, so, i think, it worth to start to buy now.
Definitely we are getting close to that much expected bottom or we have already found it. And yeah it's officially the longest bear market in cryptocurrencies so far. So yeah a great time to slowly start buying, I think that great years are ahead of us, where cryptocurrencies and blockchain technology might finally get adopted by a lot of people, or even that long awaited mass adoption might happen.