We should sell such outdated coins like Tron because such coins will become more and more obsolete over time.
There are many of them which I have no interest to mention any of them. People can just go through the exchanges the old coins are listed and see how disappointing they are now. Many of the new coins now will also become old and not get to all-time high when bitcoin is getting to all-time high. Altcoins are like pump and dump. The ones that are successful now will later not get to all-time high which means if you make money from altcoins, sell them and do not expect their all-time high again or for a long period of time like decades or forever.
Many people mistake altcoins investment to mean a long term wealth creation believing that one day they coins are going to pump in price to make them millionaires and billionaires, instead of taking altcoin for what their are just for speculations it make no sense to rely on coins most especially now that we have realised that altcoins can become worthless in a space of time.
The old worthless coins were once the hype of the moment in the past and there are many investors who were caught off guid into not selling their coins when they hard good chances of making a gain, this approach make the to lose all they investment, because they believe and wanted the coin will give them Usain profits.