Many of these old coins are going to die this bullmarket reason being that they offer nothing to the space and no one is actually using them, those that rebrand and adapt to the present reality would survive but those that do not would die, just check the front page of coinmarketcap in 2015 and 2016 and you will understand what I am saying
Markets are always changing, and if the coin doesn't stand out, investors won't be interested in the project. I feel Defi is making this market come back and very similar to 2017 so I believe this will be your chance to consider investing. Opportunities appear every day and you need to seize opportunities early to make a big profit.