Don't predict the bottom, just do Dollar Cost Averaging or Averaging down to accumulate more Bitcoin. We're as a Bitcoin enthusiast are looking for long term, not short term or instant profit by pump & dump of shitcoins. Also there's nothing wrong to diversify your investment, but make sure you're diversify to other assets/commodities e.g. gold, silver, bonds, real estate etc, never diversify to shitcoins since it's worst than Bitcoin.
Exactly, leave the pin pointing for professionals. Even they mess up a lot of the time. If it was easy to find out the area where an asset would bottom or top everybody would do it. It is not like trading is some secret dark magic, but it requires a lot of dedication and committment to building specific skills. That doesn't come over night, it requires sacrifice and I'd say passion for the markets.