It appears that recent short term downturn for altcoins market is passed, with Bitcoin is also rebounding from downturns of last 2,5 weeks and now it is trading above $69,000 often setting the tone of cryptocurrencies market. Nevertheless, it is crucial to recognize that crypt currencies market is very volatile and unpredictable therefore we may encounter similar cycles of ups and downs in future.
That's sort of my reasoning as to why top 50 Alt-coins won't go down another 10% because Bitcoin has stabilized around high $60k, and with the upcoming halving, I don't think it'll plummet enough to drag the Alt-coins down further.
That said, Alt-coins don't immediately react to Bitcoin halving, at least not based on the previous cycles. That gives me a pause to see if I should wait to buy back in a bit later, or shrug this off and just buy now for the next uptrend.