Is there any particular reason Bitcoin has jumped 100%+ in 5 months?
No any particular reason for this. Same as Clasical economic theory : Suply and demand.
What happen on Bitcoin today same as You want to buy product but decrease on market and you add price to high to get it.
I think that's the simple reason of why Bitcoin is going up. And to add the fact that crypto adoption is really growing day by day. More individuals and institutions are learning the advantages of being acquainted with crypto.