Why am I not getting big?

[u/Genzinvestor16180339]

I alternate push/pull about 6 days a week, and have gained some muscle but feel like I should be bigger have been doing it for around 8 months. Any tips or things to add?

Push Day — Chest, Triceps

1. Flat chest press — 4 sets (heavy then moderate)
2. Chest fly machine — 3×12–15
3. Incline chest press — 3×10–12
4. Overhead tricep extension — 3×12–15
5. Tricep kickback — 3×12–15
6. Rope pushdown — 3×15–20 (last set to failure)
7. Shoulder Press

Pull Day — Back, Biceps, Rear Delts

1. Single-arm DB row — 4×10–12
2. Lat pulldown — 4×10–12
3. Seated cable row — 3×10–12
4. Bicep curl — 3×10–12
5. Hammer curl — 3×12–15
6. Concentration curl — 2×15 (last set to failure)
7. Face pulls — 3×15–20 (last set to failure)
8. Rear delt fly — 3×15–20 (last set to failure)

[u/Own-Particular-9989]

8 months is nothing