Well, you can still invest on some altcoin but at least the your portfolio should be like more than half on bitcoin, just saying.
This is actually called a diversed crypto portfolio. If we are talking real portfolio ratios, 25% should be in fiat, 25% in Bitcoin 25% in altcoins and 25% in land or some medium risk legacy investments. Altcoins have the highest gains and risks.
Always better to plan and make a good mindset, diverting your assets always bring good things whenever you have good knowledge bad understanding, stop chasing something that still speculative but rather focus from something which is already been offered, always make right assumptions and be ready to add patience.