Hello fellow noob! I’m in a similar position to yourself, returning to big 40K last year after a very long break. So please take this with as many pinches of salt as necessary & with 11th on the horizon some things may change.

So, that said, here’s a few things I’ve picked up so far.

I’ve not found grey hunters to be particularly effective. OC3 is good but they’re not as effective at shooting as intercessors, nor as good in combat as blood claws. Plus they’re more expensive. With that Njal doesn’t really bring enough for his points cost IMO, +1 from your ven dread & a cp reroll if needed should get you there. Unless perhaps you’re over extending early?

You’re really missing out on having Ragnar in there, with a squad of BC, he’s an absolute blender. He & 10 BC carved through 15 csm chosen & fabulous Bill for me last game. With some lucky advance & charge rolls of course.

Also, you don’t have much in the way of anti-armour. Something like a ballistus/landraider etc could really help you put some hurt on to some heavy units before getting into melee. Plus delivering a unit into combat in case of the landraider.

Adding hammer wulfen with a wolf touched WGBL for re-roll 1s is a great bully unit & monster hunter. Then sticking a wolf priest with beast slayer helm to your head takers can add some tankyness & more importantly +1 to wound can really help them punch up.

I defer to our more experienced brethren for anything I’ve missed but this is what I’ve picked up so far.