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.
the top 10 altcoins could also be displaced and disappear let alone 78th place, there is always a risk when holding altcoins for long periods, especially low cap altcoins
being listed on top exchanges is not enough to guarantee its safety, they can list it while it is still a potential project but they can also delist it at any time it becomes useless or not growing
if you believe ziliqa will grow in the future then you should invest but only invest with money that can lose