I remember I have an Aeron coin in my wallet and earlier it has good value. When it has been delisted from the Bittrex exchange I did not calculate the situation properly because of lack of experience at that time so I could not sell it now it is worthless so we should be always careful when a coin is delisted from the exchange. I know when top exchanges delist any coin it impacts the growth of the project to some extent like this investor of meme coins should also be careful if any of the coins are delisted they should have plan B also if anything happens like this.
If you are holding a new altcoin, it is recommended to regularly review the daily trading volume because for altcoins that have been listed there is no guarantee that they can be traded forever, but the fact is that if an altcoin is registered but no longer meets the criteria for trading on an exchange, it is likely that the coin will be delisted from the list.
Daily volume trading most effect to make some altcoin delisting on exchange market, I think you have give best recommended for investor with long term holding on altcoin assets. Every day have to check with transaction volume still potential for increasing up or not, when have less transaction volume have chance for delisting on exchange market beside still have another reason with delisting coin if indicate as scam project or developer got trouble in their country.