Never hold any altcoin for long time. It is possible that the coin will be lost forever from all the market, there will be no volume at all etc etc. Because you don’t know what's going to happen within these long time. There are a lot of examples, many coins were in huge boom in 2018 altseason but they don't exist now. Even if they exist, they have no volume.
Although holding altcoins is full of risks, I see Ziliqa is a little different, based on CMC currently Ziliqa is ranked 78th and has been listed on Binance and several other major exchanges. in the next 3 years, it looks like this token has good potential and maybe it can go up a few percent.