Your price target for ETH is only realistic when we'll see another altcoin season. But when will the Bitcoin dominance decrease and altcoins pick up pace? That's the big question. Right now it looks like only Bitcoin is leading the way and alts cannot follow.

Whether you made a mistake or not depends, in my opinion, on whether you bought ETH with fiat or Bitcoin. If you sold your Bitcoin to get some more ETH, it wasn't very smart imo.