Bitcoin is not everything , you can still have a good portfolio without it.
Why add Bitcoin now? It maybe 2x this year from current price and will then spend the next 2 years after that going down in bear market.
Altcoins in the current top 100 or so give you a good chance of making very good money this year, Bitcoin doesn’t.
In my experience market-making yields me higher profits than HODLing, so BiTCoin comes into it via being the buy-side of my trading-pairs of at least some alts.
That way I not only gein more of the alt faster but also get bitcoin profits too.
In fact it is usually the bitcoin rather than the alt that I from time to time buy fiat with to pay such expenses bills etc as require fiat.
-MarkM-