For new investors, it is indeed profitable because they can buy good coins at low prices, but for old investors, they suffer a substantial loss. The advantage of a declining market for old investors is that they can accumulate coins or tokens, so the average price of their investment is low
I agree with you, like me who has been holding altcoin since 2017, hoping that if 2020 bullrun happens so I can sell all my altcoins and start investing in bitcoin even though I think it's a little late.