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.
Invest on projects which you do see that has really the potential.I havent checked about Ziliqa project but it seems that it does really have that good potential basing up on other feedbacks as well
but it is always important that you should really be doing more in depth research whenever you do make out decisions on investing on particular project.We dont know on what the future
brings specially with altcoins but much sure that there are projects which are really that worth for you to hold on long term aspect but its up to you whether you could
really throw up some risk or not.Always be mindful about this matter.