Need some advice from you guys

I’ve been on past 3 cycles over two years...
as 3 months test x 500mg a week for 12 weeks / Deca 400mg 12 weeks / Anabol First Five Weeks.

Been taking PCT Nolva and Clomid as HCG not available here.

Taking a break same as on time in between,

First cycles I ran great gains and kept majority, but past last two very little gains in strength or size. Mention I gained 20kg and kept about 18 after PCT on the first two cycles combined

Not having issue with PCT just the gains. Have been eating strictly consuming 20 egg whites a day mixed with whey plus 6 measured meals protein and carbs.... nuts etc for snacks about 600gr a day. Training 4 days a week heavy lifting.

Going to start new cycle and a few people saying 1000 Test a week (16 weeks) / 600mg deca a week (16 weeks ) 100mg Anabol ed (6 weeks) stanazolol tabs 50mg ed for last 6 weeks of cycle.
Arimidex 0.5 eod.

PCT Nolva 40 / 40 / 40 / 20 / 20 (total 5 weeks.)

Anybody got any suggestions on the above for next cycle? Should I expect to see better gains?