I might be one of the few people that is different only because when I went up to masters I found it easier in a way. I don't know why but when I was in seniors I struggled to win a Battle Roads and yet as soon as I got into masters my premier rating after autumn Battle Roads shot all the way up to 1700. I guess something that had been helping me out during my years as a senior was that I had been playtesting with all the masters at league and never really got any testing done with people my own age/division. Hopefully this sort of thing happens for you and if it does great. If not, just do what everybody else said and try to play as much as you can with the other masters (because belive me, masters play completely different from seniors) and just try and get used to the newer metagame.