Doing a portfolio now without having BTC in it is really dangerous.
If BTC rally up, you will be rekt .. I did the same mistake when I started, I bought ALT only, biggest mistake I have ever made in crypto.
You always should balance your portfolio with AT LEAST 30% of BTC in it.
Why though? If 30% of my portfolio is BTC, that would amount to just under $2,000. In turn, that amounts to 0.2 BTC. The only way those 0.2 BTC help me triple my initial investment, is if BTC itself grows by 1000%. Some expect it to go to $20,000 this year, others to $50,000, but most simply expected to surpass last year's record. So even if we're optimistic and say BTC will head into 2019 valued at $50,000, that lands me $10,000, and I've given up 30% of my investment for a huge "what if", a 500% increase in valuation that's only happened once in 2017 (part of the 1000% increase when it went from $2000 to nearly $20000 in 7 months). I'm not saying it can't happen, but even if it does, all those other highly ranked altcoins should go up as well.
Am I wrong? Should I really get BTC now when it's going up? If it was $8,000 like earlier this month, I would have definitely done it..