Drop some calories, not a lot, load up on water, and bump up on the cardio, HIIT, or whatever you do for your conditioning (easy to say but harder to do).
Some people opt for stims or chemicals meant to speed up the metabolism, but I don’t, so I won’t comment on that strategy.
I know you monitor your bloods religiously, so I seriously doubt it is related to anything in that department.
If you’re planning on running the cycle longer, you could drop the Deca and go with tren or….and this is just me, lower the Deca to 150mg/week or so and add low dose tren(200mg/week). I never really have any problems running 2 19-nors when the doses are kept on the low side.
On the flip side you could throw the kitchen sink at it and run higher doses, but that’s not my approach, so again no comment on that.