Well I am not sure for others but for me I think investors especially new investors should focus on Bitcoin investment first and keep accumulating as much as they can because managing multiple investment requires a certain level of experience and financial stability. So before diversifying you should ensure that your investment goals are clear and won't be compromised. If it will be affected then it's better to prioritize accumulating more Bitcoin until you have achieved what you are set out to do or at least reach a certain level that won't be affect your goals.
No need to rush into diversifying, there is no deadline. You can always diversify when it's safer.
This is what people don't understand, the word diversification should come in when you've gone to the level of your satisfaction in Bitcoin and even if you have too, you would have to weigh options before diversifying, when I said weigh options, I mean trying to know if what you are diversifying to is better or will be better than Bitcoin so that you go wasting your time while you are supposed to concentrate on Bitcoin alone, personally I keep saying it am not a fan of any altcoin out their, if one wants to diversify it should be in other stuffs, I know people will say it is not a nice idea for one to put all his eggs in one basket yea this may sound nice but how sure are you about the other basket that you want put or shield I say lay lay your eggs, how secured and trustworthy is that basket and how sure are that such basket will not get leakage in a shortwhile.
For me is always Bitcoin, I wouldn't decide for anyone but I won't stop telling individuals what I feel is right in this space but their individual decision surpass my advise but I can't give up on this because that's what I think is applicable here.
It's the same for people only focusing investing into gold first than people spreading their investments. For me, it's more safe to focus on something you really know and accumulate it for few years. Immediately diving into different investments just because you heard it's a good investment but you have no any other info about it is dangerous.
Having multiple investment also will divide your time. Instead of you only focus on learning more knowledge about that one particular investment, you will have information overload learning multiple type of investments.
Best strategy is focus on 1 investment first like bitcoin, accumulate it for few years while learning its pros and cons before you procede to altcoin investing. It's less-risk and less stress for a person doing that approach.