I've seen a few lists making use of Guardians for troops, and then trying to gunline it up. I would really focus on doing this with your list.
personally I would drop all of your ranger squads, leaving you with 3 squads of guardians. Then add embolden warlocks, so the guardians are less likely to cut and run, Eldrad, and drop the night spinners for 9 scatter laser war walkers.
Then with 3 guides a turn... you can imagine what happens next. any heavy armor gets nuked by the dragons.
essentially, I'd try something like this
Eldrad
Farseer- Guide
5 Dragons
Wave Serpent-
tl cannon
5 Dragons
Wave Serpent-
tl cannon
7 Harlequins- 7 kisses, shadowseer
10 Defenders+ warlock- scatter laser, embolden
10 Defenders+ Warlock- scatter laser, embolden
10 Defenders+ warlock- scatter laser, embolden
3 War Walkers- 2x scatter
3x war walkers- 2x scatter
3x war walkers- 2x scatter
thats a lot of twin linked s6 shooting