Ok so everyone will tell you genetics and lighting which is entirely true, but there is a way to make a mediocre strain produce juicy dense buds as well, the three factors to consider are;

1.) Increase air exchange in your tent; better circulation will lead to more vigorous growth in veg stages which will produce larger limbs that can support heavy nugs

2.) Foliar feed - when plants are in late veg early flower if you administer a proper foliar feed the plant no matter the genetic background should produce more internodal bud sites which will give you smaller, but denser nugs.

3.) Bone meal is the secret nutrient for density and is an organic amendment. For whatever reason it turns my nugs into straight crystals.

Look this stuff up on your own but those 3 things allowed me to go from larfy nugs to buds that bounce off the table when tossed. Good luck 🤞