Continuing cycle past 12 weeks

[Hourman39]

I am on my twelfth week of a test e cycle. 300mg 2x a week. I just received a vial of 250mg, as well as d-bol 10mg and tren 75mg. Would it benefit me to extend my cycle another 4 weeks, and stack the other 2 on top? Or should I save them for my next cycle?