The current bull run is going to last until at least well past the halvening next year, when the value of mined bitcoin will half. My own view is that the price by then will be over $40000 USD, and potentially could be closer to $100000.
Due to the scarcity of Bitcoin, and current and projected demand, we can correlate that into a likely price range. Whilst this early stage of the bull run may not hold, and we may hit a new low level in the coming months, perhaps around $4000 USD. Any return to the lower price levels, will not last, as we have seen very strong demand to purchase when the price is around $4000 - $4250 USD.
Do you have a viewpoint on the likely price when we approach the halvening next year? Do you have the maths to calculate the likely price in that time period.
Network effect for BTC demand is causing Bitcoin to continue to gain in popularity, and in value.
Whilst Altcoins may outperform the returns we gain on BTC, those Alts will also come with much higher risks of losing money on many of them.
Be careful with spreading your risk by buying too many crypto currencies, I personally have recently sold out of 4 altcoins and am now holding just 6 different crypto currencies, with over %65 in BTC.
Whatever you do, don't fall for any trading scams, just buy cheap on the dips and hodl, traders lose their money in over 90% of cases.
Dollar price averaging, and buying small amounts on dips regularly will lead to a great portfolio with significant profits in the long run.
By the way I am not a advisor, I am simply sharing my own point of view. All risk is your own. Educate yourself.
Bitcoin is the best and strongest crypto, so it is more secure , and in most cases leads to the most consistent profits too.
I also hold some LTC, SBD, ETH, OMG, and DASH.
Good luck with your own portfolio.