If there is a bitcoin bull run then obviously altcoins don't go up at the same time however when bitcoin has a pullback in price then do altcoins shine
I'm not a crypto analyst, but I've been watching the market for a few years now, and to my eyes there does seem to be the kind of pattern you described. I've always assumed that since there is a finite amount of money being invested in the entire crypto market, sometimes it gets a bit lopsided--like right now it looks like most of the money is going toward bitcoin, which is boosting its price.
And yeah, I think altcoins will catch fire again, and for some reason I think it'll probably be soon. I also hate to admit this since I'm a huge supporter of bitcoin, but lately I've been trading my bitcoin for some altcoins that I can stake for interest/dividends. The prices seem very low, and bitcoin's price is sky high, so I figure it might be a good buying opportunity right now.
What does it take for one to be an analyst? Your analysis and speculation in recent time has shown that you are one of the crypto currency speculator/analyst.
Back to OP, altcoins will return to where it was in 2017 when Bitcoin price skyrocket in its market value, it is only then that altcoins will start bullish trend and remember that one cannot be optimistic about when exactly that will happen to altcoins.