Days of "only bitcoin" are coming soon, just wait and see. Bitcoin is about to start its super bull-run, and once it does, alts are gonna suffer. You might then pick up some of your favorite alts and enter them, but entering alts right now isn't the best thing to do IMO.

Bitcoin is about to take-off, there's a huge probability of it right now, it has broken the downtrend, once it does, proud owners of alts are gonna cry, again.