42k is an important area for Bitcoin, it has acted as support and resistance at critical times, and is also a good visualization of sentiment. There's also confluence with the solid green trendline, a bounce there is possible.
Above 42k bullish, below bearish.
Bitcoin has been holding it's 30-31k support line fairly well. It just broke diagonal resistance and retested it, flipping it as support. It's currently trying to resume it's way up to the next mayor resistance level at around 40-41k. It still has a way to go before we can say the bull market has resumed, I would be very careful until it clears the diagonal...