Does Bitcoin actually have a Dip season? Or just when you are capable to purchase that comes the investor Dip time?
Anyways, let me just say buying at the Dip and holding is the best format to purchase your Bitcoin and accumulate as much as you can while the markets erupts to be appreciated in values.

While we alternates to diversify our investment to the altcoins, I don't think if there would be confidence of reliability to buy and hold for such a long term while aiming for increments in the market value. Believe it, altcoins cans be funny.