@steak55
My training age is the same as yours, except that I'm a fair bit heavier while being a couple of inches shorter. I always get guys at the gym asking me how I build my shoulders or quads. They never like the answer
which is: lift heavier and eat more. Want bigger quads? Squat more. I did 20 rep squats for months last year while eating lots of steak, chicken and eggs. Did any of the guys with small legs try that? Nope, and so they're stuck with small legs.
If you want to do bodybuilding, that's fine, but you still need to lift heavier. Frankly your lifts are piss weak. I have a few friends at the gym who are into bodybuilding (despite me trying to convert them to powerlifting many times). They're between 78kg and low 90kg, 5'6" to 5'11", ripped and very muscular. Those guys lift big. The 78kg fella (also a sprinter) benches 180kg and squats 170kg for 3x5. The 85kg guy deadlifts 170kg for 3x12. The 90+kg guy benches 165kg. Now their lifts are kinda out of whack cos they do bodybuilding and not strength training (e.g one guy has a poor squat relative to his bench) but you can see that they are fairly strong.
You're not gonna get big squatting 80kg and benching 60kg. No need to tell us the excuses. I do all three big lifts in nearly every session and while not maxing out every time, I'd still lift way more in each. And I'm far from being a good lifter, plenty of guys lift a lot more than me at my weight, train harder and often have a better body as a result.
Lift heavier, give your body a reason to grow.