You mention FLL, but I am assuming you mean SEA-FLL. The new SAN-FLL has light loads in F and very few elites on board so I've gotten it a few times as a 75k. Last week the FA mentioned I was the only 75k on the plane.
I have never received an upgrade on SAN-SEA in either direction. 75ks everywhere and plenty of people paying for F.
I am waiting to see how things start to shake out post-COVID, will business travel resume for everyone (it already has for me) and will that mean greater competition for upgrades from fellow elites.