Everything is set up for a bull run for Bitcoin. You are right, it has been a good rally for altcoins. It is a good time to move some profits to Bitcoin, but I personally believe the best strategy is to hold the coins you believe in for the long run. For example, if you hold Cardano, it could be a good move to move some profits into Bitcoin while Bitcoin goes back up to new all time highs. Then, when Bitcoin gets hot and Cardano goes down, put more into Cardano. This is a tough game to play though. If you believe in Cardano, just leave it there for the long run. In fact, it could be years before Cardano comes to fruition. In fact, it might be years before many of these projects start to become used in realtime. Right now, we have Crypto Kitties being used. At the same time, Ethereum is running as well (since Crypto Kitties is running on it). However, Ethereum hasn't been working properly. It will need some upgrades to see if it can scale.
Which brings me to my next topic: scalability. The coin that can scale will win. I don't mean it will overcome Bitcoin, but it will succeed. I do believe Cardano will be able to scale which brings me back to my first topic, investing in projects you believe in, then be patience. Though prices might not be rational right now, they could easily be justified in the near (and certainly far) future.
RE: Is Bitcoin Set to Take Over Again?