Hey sorry I took so long to get back to ya. As far as keeping gains, you of course want to recover from any suppression as quickly as possible. Your run wasn't overly long and I imagine is not super suppressive, and with you being 23 years old I bet you recover pretty easily.
I know what works for me when coming off-cycle, doesn't necessarily mean it is right for you, but you can get an idea from what I do.
I tend to keep my calories on the high side in pct, especially peri-workout. The idea is to keep catabolism at bay. I find manipulating insulin with high carbs and maybe a gda can help a lot. Diet is still most important when keeping muscle gains.
Supplement-wise I usually throw in some natty anabolics like follidrone, trib alatus, ashwagandha, forskolin, good pump product. I try to cover the bases: protein synthesis, raise/enhance natural hormones, keep cortisol in check, I also like to keep estrogen low. Stims can help with any low energy you may experience.
I don't change my workouts much going into pct. If anything I may not workout quite as often, simply because my recovery is no longer supercharged. But I keep intensity and volume just as high if possible.
You are doing great though man, I bet you have no problem retaining most of them gainz. Good luck!