I feel like it's most especially hard to get big returns on alt coins considering there's just so many. Your safest bet will probably be the main coin which is bitcoin which is forecast-ed, in the foreseeable future to multiply its own value by 10x.
Yeah, most especially since bitcoin tend to drag their growth down. However, it is not always that bad as there would at least be a limit to how much they can really get dragged down and at the long run, they will still get to do well at the end of it all.
No matter how much they get dragged down with bitcoin's dominance. In 365 days, choosing the right coin can really make x20 possible and assuming the OP to be trading some of these coins, he could actually get some of it.