I don't like altcoins. I have invested mostly in bitcoins, a small amount in altcoins, also in different coins. However, it is possible to make a lot of profit from altcoins, but we don't know which coin will pump more. Now if I have to talk about my expectations then I don't expect much profit. I will be satisfied if I get 2-3x profit. Altcoins are risky, if I expect excess profits, then losses may occur instead of profits. However, if you expect 30x profit I think it becomes too much. Some altcoins are not profitable in the long run. I don't know which currency you have invested in. However, expecting too much profit can lead to loss, so be careful and make sure to sell at the right time.
When it comes on selling or dealing up then it will really be just that depending on you whether you would be focusing on Bitcoin or with some altcoins on which this will really be that depend into someones investment decisions because there are ones who do really want or love on dealing up with less risky and thats why they would really be that going for Bitcoin but there are those people who are really that wanting to those coins/tokens on which it could bring up that potential much bigger profits and thats why they will really be that choosing up instead on trying out to stick with Bitcoin. Speaking about on when to sell then it will be that in accordance into your selling point.
Make it sure that on the moment that you do sell, then better not to look back because once you've seen your selling decision turned out to be that too early then you will be having that kind of regret on which this one will really be causing up that possible re entry after your exit or selling decision on which it will be leading into possible negative if the market will really be trying out to make some u-turn. We do know that there's always that probability when it comes to change of trend in a snap. This is why you should be that careful into the actions that you are taking on.