When BTC recovers and creates a new ATH, crypto community will trust that Altcoins will also rebound strongly. I am still holding Altcoins and waiting for the altseason, first the recovery of the top coins, then the midcap coins and then lowcap coins.
Excluding NFTs, I've taken most of my altcoin profits back to Bitcoin for time being. I believe the next altseason will be at the end of the year or early next year. A key pattern I've seen in Ethereum when it broke $1,400 this year, as well as around $400 in 2017, is that it continued to lose Bitcoin value after breaking new ATH against USD (-30% & -70%).
Similarly early this year the altcoin rally (against Bitcoin) didn't start when BTC broke $20K, but when it got to around $30K (+50%). If Autumn/Winter 2017 is anything to go by, given so far the altseason has been the exact same time-frame, Bitcoin dominance is likely to increase towards the end of the year once Bitcoin reaches 6 figures.
Of course the price of altcoins against USD (as well as plain paper and dog poo), will likely maintain it's value or increase. But I'm personally not willing to risk losing half of the Bitcoin value in the meantime, while waiting for altcoins to finally moon again. I'll buy back into altcoins at a discount, not a premium.