Domination is near big support, there is probability that the domination will rise from that support around 39%. If this will happen and the price of btc despite that will go down, it means that alts will bleed a lot, 2x more than btc. If the price will rise along with the domination it simply means that the money will be going mostly to BTC and alts will rise slowly. The other scenario is that we will break that support and domination will fall to around 35% in this case we may have similiar situation to January 2018 when the huge altseason started. We can also see that there is divergence on 1D timeframe on MACD which may suggest that we won't break this support and the dominance of btc will start to rise.
Be careful, always do your own research.
It is not financial advice, I'm just sharing my personal view.