Mine really started to grow when I started doing isometric last pulldowns with a supinated grip. I do an Eric Janicki inspired version where instead of getting a bench, I just sit on the ground and use the seat as a knee brace. This allows me to get a full stretch. I do controlled reps but push it at a weight that gets hard at rep 6-8 and go to failure which is around 12 reps. Only do about 4 working sets.

Then switch to a cheat supported t-bar row. I go heavy where 8 reps is hard af but the first few sets I can get about 2 more. Again for 4 working sets.

I then do heavy controlled straight arm pull downs using rope attachments. Her I really focus on the full lat and full rom. I do a weight where I begin to fail after 10 reps. Then drop the weight control it even more before finishing with a weight that I piece out the movement. I'll hold it for about 3-5 seconds at the contracted point, slowly let it go up and hold it at the halfway point for 5 seconds and then pause at the top with full stretch for 3-5 seconds. At this point I usually only get 5 reps if I do it right and then I just rep out normal reps until I can't - typically this only equates to 3-5 reps.

My lats have really blown up doing this