New investors still needs to diversify and stay informed because it’s crucial to managing risk effectively. Most of the no coiners have regretted heavily of not investing long time ago, they should know that regret over missed opportunities is common in life. They should see now as an opportunity to start there investing journey, focus on the present and future because will keep rising and other cryptocurrencies.
I don't see diversification as a good practice in this crypto space because aside Bitcoin, their is no other crypto that is as reliable as Bitcoin, because Bitcoin has proven beyond reasonable doubt that it always recovers even when it dips in price, so it's safe to invest in Bitcoin only.
But if you are hell bent on diversification, then it should only be considered when you have gotten to that over accumulation status, and you should not be diversifying into alt or shit coin, but you should be diversifying into land or real estate, so you must get to that over accumulation status first before thinking of diversifying, if not, it's a wrong way to invest in Bitcoin.
A new investor doesn't need to diversify in his early stage of building his bitcoin portfolio because he is still a low coiner. However, if you have accumulated up to 50% and above of your bitcoin target and you want to diversify into other asset that is not in line with bitcoin, there is no problem about that, if you don't feel secured with investing into bitcoin alone.
The reason for diversifying is to put our funds into different assets for a better financial security so that, if any of your investment is not doing well, the other one can balance it. However, before you diversify, you have must have a good knowledge of that asset which you want to diversify into so that, you don't do it wrongly and run at loss with regret in future. If you don't have the knowledge of whatever asset that you want to diversify into, it's better that you don't diversify but stick with building your bitcoin portfolio and hodli for the future.