You haven't lost what you learned that 6 months. Keep what works, add some other recovery tools, and get rid of what did not work. I am a retread also...but have over 2 years now. For me what helps is to take it one day at a time, remembering what it was like (consequences), prayer, SR, AA, sponsor, reading, music, writing, helping someone when I can and wanting to live right with God today.
Glad you shared...back to SR and willing to be sober.