If BTC Bullrun starts, maybe your Alts will fall hard.
Under current circumstances I would not advice anyone to hold portfolios in which less than 80% of the net wealth is being made up of Bitcoins. Altcoins are going down the drain and everyone knows why that is happening. A recovery can only occur if the ICO market reinvents itself and as of now it looks like a very distant possibility. IEOs are also not attracting much investment now after a lot of hype surrounding them in the beginning.
The main problem with alts is that they went up by too much during the last bull run (2017). Many of the altcoins went up by 100x or even by 200x. And even now, the prices are much higher than what we had before the 2017 bull run. Some users are saying that we can invest in these coins now as they have lost 90% to 99% of their value. But they are forgetting the fact that the prices are sill high when compared to the 2016 levels. And there is a good chance that the prices will fall to that level.