Pretty impressive that you were at a deficit like that and was still able to put on muscle. I have done one quick bulk in my life and when I cut back down (using IF not Keto) I lost everything I gained in both fat and muscle.

What was your sleep like then? I think if your diet and sleep is in check you can still go hard but my sleep hasn't been great though I have really stepped up my quality of food.

I should see where my calories are at these days, I doubt I am where you were but I am pretty sure I am under 2000.