Although I wouldn't advice anyone to invest in shitcoins even after accumulating a good number of Bitcoin, but if you must, Bitcoin accumulation should first be prioritized over shitcoins
As long as Ethereum is not Shitcoin, that means diversifying can also be done to fill our bags with Bitcoin and Ethereum as the most stable cryptocurrency assets among others. Regarding your suggestion that you don't need to buy shitcoins or maybe memecoins (my assumption), I slightly disagree... sorry. Until now, in my opinion this is still a pleasure in itself, allocating 1% to memecoin or shitcoin in the hope that there will be an increase of x10 or x100 is sometimes fun too.
My main focus remains on Bitcoin and Ethereum, while shitcoins are just a complement so that my life is not boring. If I had $100, maybe only $1-$5 would I spend on shitcoins... yes it's small, because I don't want to take that big of a risk either. Just want to have fun.
Seems unwise to some people, but I feel happy to do that.