I do not know about several years, but I also hold coins for a while after the bounty. It seems to me that let a few coins and fall in price, but a few can give a very good growth and pay back the losses
I do not know where you got the information about 90%, but in my opinion most altcoins from the top 100 are decent altcoins with good growth potential. I would look at the XEM in your place. As for me, this is a very underrated altcoin
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