Lately (few months) I haven't been too into altcoins, that's because I've pretty much 100% of my portfolio invested in Bitcoin (BTC). But if we were to have a decent pump in altcoins, I think I'd sell right away. Reading your story, it seems you still lack understanding on how money management works, if I were you & got a high percentage, I think I would sell it (at least get my initial money back).