Personally, and in my own opinion, we plebs shouldn't treat our little/limited capital like it's Warren Buffett's billions that needs to be "diversified". It will slow down our ROI plus it's probably not needed. Diversification is made to protect capital and control risks because their billions has more to lose in every small market move. For us plebs, if we truly want to make life-changing profit, then, only my personal opinion, we should take more risks and concentrate capital to just one investment that we can have strong conviction to HODL long term. If you ask me, it's a golden opportunity to buy and HODL Bitcoin. 
No, we don't treat our capital like Warren Buffett's or other rich people. We try to arrange our capital to invest in Bitcoin. If we make a profit, we can give more portion to invest in Bitcoin while we can also think about adding more investment so we can increase our investment portfolio. That will give us more profit in the future because we can have many investment and not just in Bitcoin.We can take more risks but we should not break our limit on handling the risks and only take the risk that we can afford. That is one thing that we must remember in investing. If they don't want to confuse handling many investment, yes he can use one investment that he can HODL long term. That means, he can focus on buy and HODL Bitcoin.
We always suggest to HODL Bitcoin to all people because we know that Bitcoin can give a big profit in the future.
As a pleb, it will be much convenient to hold Bitcoin instead of any other substitute due to the motion of continuity and good amount of profit as long we continue to hold.