Investing in multiple coins can be leasing if you are not an expect in the case that you can get to loose track of ypur investment so i asvice you invest in just one or two coins and face focus on them only, that not been said i advice you buy BTC and any other alt of your choice
i will only invest to the coin that i think has a potential seperating your investment will be a good way but only invest in waht you are trusting most .
For sure people only invest in those coins which they trustily having in their portfolio. I guess the bitcoin is the best coin to invest and hold for long term. I prefer investing in only one coin which has potential and value in market. Bitcoin and ETH are my investment i know its going to be profitable and it is best Altcoin.
here, probably, the first 2 coins are the best investment, and even if you just periodically take profits in stable coins at a small elevation, you can well increase the value of your portfolio or at least pay back your investments