Conclusion
We should sell such outdated coins like Tron because such coins will become more and more obsolete over time.
I don't recommend selling altcoins that people own including old altcoins like the OP mentioned because I don't know much about them.
The potential altcoins that are worth maintaining are Ethereum and BNB because these two types of altcoins have owners who are consistent with their future in the market.
I myself don't have much Ethereum and BNB stored in my wallet because my focus is only on Bitcoin as a future asset.
If it is in the personal opinion of each person in choosing coins that obsolete altcoins need to be sold, that is their right and if I were given the right to recommend, the Bitcoin that I would recommend to own is more with a percentage of 70% BTC and 30% altcoins such as ETH and BNB.