The momentum effect is that if the bitcoin price rises continuously over a week, it may keep growing for the next week. This is a common feature of almost all known asset classes, and we have found that the momentum effect strongly affects the cryptocurrency. We have designed a simple investment strategy in which investors buy Bitcoin only when their price increases by more than 20% from the previous week. This strategy has excellent returns and a very high Sharpe ratio. 
What improvement did you talking about ? I think the most important thing to improve in bitcoin is the transaction speed.
If bitcoin network can processing more transaction per second, it will become easier to use as a currency.
I heard that lightning network for bitcoin is keep developing now, let see how it will go later.