If you are really able to limit your exposure to shitcoins to 20% or less the size of your bitcoin investment (or the amount that you put into bitcoin) without cheating, the that is likely going to save you from losing too much, yet there are not too many folks who can limit their shitcoin exposure, and I frequently recommend no more than 10% exposure to shitcoins, yet if you can be strict with yourself in regards to the 20%, then it could be reasonable, even though it is a higher percentage than what I would recommend. I personally have less than 1% of the size of my bitcoin investment in shitcoins.
My younger brother was a big shitcoiner and he was happy and glad keeping and buying these shitcoins. When I traveled back to visit him, I saw his deep involvement in them and I asked him if he has bitcoin, he said just little amount but he has more of shitcoin. I laughed at him and told him the difference between bitcoin and shitcoin, he doubted. After a month, I went to him again then bitcoin price was pumping, he got frustrated and told me that his portfolio reduced and the price is still falling.
I laughed at him again, and told him that he is holding a valueless tokens. He believed and accepted immediately. Instantly, I told him if he has funds, he can buy bitcoin, he did as I advised him and now he was smiling to me last week that his bitcoin investment is growing. I laughed and looked at him that he hasn't seen anything yet, he should just keep on buying weekly and in future he will understand. Bitcoin is a good asset and no coiner and lower coiner should stay focus in building and growing their bitcoin portfolio for the future.
I agree with what JayJuanGee said, limiting our exposure to shitcoins will definitely help our investment and lessen the losses. 20% is fair enough but I also would recommend lower than that to play it safer but it is all based on our individual risk tolerance though. Anything higher than 20% is not ideal at all if you must invest in altcoins.