You can cut your losses to some extent by.
*investing in several top altcoin(spread your investment)
I agree with this point. Because in my personal opinion, a good investment is indeed not investing in one of my altcoins but many altcoins. With that your loss is certainly not so big. If one of your altcoins decreases, of course the other altcoins will reverse your losses. So from me I am happy to invest in many altcoins, especially the top altcoin.