This might not be what you are looking for but maybe it is useful. Its a one-goal answer with no consideration given to any other goals beside muscle gain:
Get as much time under tension as possible: more reps, more sets, more days per week. Go to near failure on at least the last set per muscle group (leave a rep or two in the tank to allow for faster recovery).
Fast tempo or motivational music to get the adrenaline going. After lifting immediately shift to calming music. Focus on parasympathetic activation. Smile, sing, laugh, deep breathing.
Use full range of motion. Build up range of motion slowly.
Try to build reps then increase weight. Err on the side of too many reps rather than too much weight. Going to failure is the goal.
Use machines to avoid injury but modify the settings (seat height etc) to get some variation.
Stress the key muscle groups in different ways in a session and over time to keep the muscle adaptation ongoing. Don’t do the same things all the time.
When you feel a tweak coming, back off for the day. A lost workout is one day. An injury might be a lost month. Maybe more. Never push through injury. After an injury, ramp back up slowly. If injured, consider blood flow restriction. For health, the biggest muscles matter the most: legs and back. For ego, it’s arms, chest, and shoulders. Ego after health.
Use a 4 week cycle to ramp up intensity over 3 weeks followed by an easier recovery week. If you feel stale, or unmotivated, take a week off.
Eat 30-40g of protein 3-4 x/ day with more than 5g of leucine. Use whey if real food isn’t possible. Eat big protein at next 3 meals after lifting plus right before sleep after a lifting day. No need to load protein before lifting.
Fish oil and eggs after lifting (I do this within an hour)
Tuna after lifting (timing isn’t important)
Calorie surplus for 12 hours after lifting; deficit later to manage weight
Collagen with vit c 1 hour before stressing tendons
DHEA in AM.
Beta Alanine can help with recovery between sets
Have muscles full of glucose before workouts
Creatine everyday (in AM to get some antisleepiness help after poor sleep)
Stimulants before lifting: caffeine, cacao, taurine, citrulline (NO). But don’t mess with sleep….the most important thing to get ready for the next workout.
Don’t drink alcohol (interferes with recovery)
Use NIR lamp to heal joints fast.
A healthy body is the foundation of a strong body. Healthy mitochondria come from cardio fat burning endurance exercise which does not build muscle. You have to be clever to fit in some cardio with the least disruption to the muscle stressing and recovery efforts.
I what did I miss?