Start over without drugs and you will be there in no time. Starting up with drugs as AAS is foolish in my mind, muscle memory is there and for me, after an accident that put me out of the gym for 15weeks, I worked it up pretty fast. I used this approach, a system that is very effective if you "once have been there and now want to get back up".
First week 3 day split
Monday - presses: Chest(bench), Shoulders(military press), Triceps(Dips)
Use these "presses", only 3 movements will do the job, too much work the first time will make you sick and out of the gym for like 2 weeks hehe
Wednsday - Back(Deadlifts), Back+biceps(Chins reverse grip), Hammies(SLDL). All pulls mostly(look at deads as you pull up the weight).
Friday: Squats, light chest like cable crossover, light shoulders sides, abs, calfs
Then take the weekend off, on the monday you start over with this program
Monday: Low reps: Incline Bench, DB shoulderspress, Sculls, Very Light Squats
Tuesday low reps: Rows, chins, bicepscurl, legcurls
Wednsday OFF
Thu: High reps: DB chestpress, side laterals, BB shoulderpresses, Narrow bench, Legpress
Friday high reps: Deads, DB rows, hammercurls, legcurls, calfs
I did something like this when I got back and it didn't take long before I was back. After the second week I had something like 4 days off before I started over. increase all the vitamines, protein and carbs, add BCAA and creatine and avena ssativa, ALA, and wehatever that will speed up the recovery from each session. I gained in 4 weeks about 14lb and not much fat either. The first 4 weeks I was able to put on a good amount of weight every session on each movement, mostly because of the muscle memory. It's like beeing novice all over again, it doesn't really care how and when you do it you will gain anyhow.
I wish you all the luck, happy recovery!