If you don't need to bulk, then deca is probably not your best choice. You can run back to back cycles with the same compounds, after doing PCT and taking your time off, but if you want to cut down, there are better options.
First you want to use a form of test in your cycle. 250-500mg test EW is a good dose. With that, you'll want to use adex to control water and bloating. You can add the winstrol to the end of your cycle, or maybe you want to change it up and use a different hardener? Something like masteron is a great cutting drug and you can run it longer since it is not as harmful as an oral. If you want to cut, here is my suggestion.
100mg Test Prop EOD
adex .5mg EOD
Masteron 100mg EOD
Then PCT starts about 4 days after your last shot