Other investments also do take time to build , rather than finding other investments to diversify on . Try looking for other sources that will help you to sustain yourself while you build your bitcoin investment, yeah bitcoin is not a get rich quick scheme so you take your time to build it well not jumping into other investments.
You have to get to a certain extent first in your bitcoin investment before thinking if diversification. Maybe then you can now think of other things you can invest on , if you start to do more than one investment at a time it will only slow you down , build your bitcoin stash first then find other stuff you can invest on .
The truth of the matter is that diversification is not a bad thing, it's a great idea, just that it should only be done when you have reached an over accumulation stage, a stage where you feels like you already have more than enough Bitcoin in your possession, that's when it feels like to try something else like investment in land, gold etc but diversifying when you haven't reach you set goals in your accumulation journey is not proper in my own understanding.
You can follow the diversification method as a means of your additional savings. Diversification policy is a very good method that helps you increase your wealth a lot. I think you should replace your additional savings in a way that is able to give you additional capital after a certain period of time. Currently, there are various short-term cryptos among cryptocurrencies which can hinder your diversification method and hinder your additional savings. So I think you should not invest your extra money in any sheetcoin or memocoin. Because these are short-term investment methods that can cause serious damage to your savings. So I think you can invest in buying gold or land in addition to investing in Bitcoin to increase the scope of your savings.