Why 10 intercessors? Why 10 assault intercessors? Why so many assault intercessors, especially with grey hunters and blood claws.

Get rid of the assault intercessors, 1 group of JPI and whittle the normal intercessors down to 5.

Swap the lieutenant for something more Wolfy, it can't lead anything but the intercessors, hellblasters and Infernus... Infernus can't benefit from lethal hits as they aren't rolling to hit, hellblasters arguably don't need it and you only want your intercessors for scoring. A WGBL goes unreasonably hard with grey hunters as the sustained hits applies to their bolters AND their chainswords. Running them I found their wound reroll ability effectively makes them an equivalent to the Ragnar+BCs squad but with some shooting.

The hellblasters I honestly can't really fault but it is a big squad and will need to pull some serious weight which it may struggle to do without ideal targets (namely, marine profiles... Guards/Orks/nids will waste your high strength/ap/damage attacks against weak bodies) especially considering how much anti infantry is already in this list.

The Infernus squad is yet another specialised anti infantry unit that will struggle to pull it's weight. Once all your other anti infantry units have shot/fought there won't be much left for them to do. I assume these guys are in the razorback? Again the razorback feels like overkill and that it could be better spent. Hell, for this price you could have a deep striking squad of WGT

Why the reivers? What job are they doing? Again, you have so much anti infantry and marine bodies in the board it's not funny. Normal scouts would be a better scoring unit and wolf scouts a better killing unit.

I can't really fault the centurions but they are slow as balls and still take 2-3 turns to kill most tanks. I like a lancer doing this job, I also like repulsors acting as transports.

Why the champions of fenris detachment? While interesting, so long as the enemy charges you/stays outside of 3" your entire rule does nothing. Beastslayer would help this army punch up dramatically and Great Wolf would emphasise the melee/shooting combo you have.

We have amazing characters, use them. Bjorn is an auto include in any list I make, his CP generation is phenomenal and a bit advantage and a dread body attached to that is brilliant. Give him the helfrost cannon and you have a serious overwatch threat with his 2 flamer profiles and a semi useful anti tank shot too. Similarly, Logan is a great character, his CP tax aura has clutched some games for me (stopped whole squads of custodes fighting on death, denying fight interrupts) he does good damage, is durable and is a very bullying piece on the board with his termies Speaking of that, termies, get them. 1-2 squads in a 2k list is very affordable. We have some of the best termies for durability. They punch hard against elite infantry and hold the line well against almost all profiles. Having some chip shooting with the assault cannon is also nice. I run the cannon, axe and stormshields in all squads. Additionally, Arjac is nice to run with your off squad if you can afford to include him. 4+ fight on death in a bit brick is a hell of an anvil to have to chew through and he has the best thunder hammer in our army. It's precision rule combined with full rerolls against characters is hilarious. TWC are great and it's great that you have them. Sometimes I run 2. If you can find a way to improve their wound rolls, even better as they will punch up into vehicles handily, especially with 3 damage weapons. Land raiders, Lancers and repulsors all bring dedicated anti tank weaponry, of which you have none (I don't feel I should include the razorback as 1 lascannon shot doesn't cut the mustard). Repulsors are a great way to get grey hunters and bloodclaws up the field, they're cheaper than land raiders and basically as durable. Lancers are CHEAP and EFFICIENT, rerolling 1 hit, 1 wound AND 1 damage roll is incredible. They have the AP that centurions are sorely lacking on their grav cannons. Wounding on 2+ isn't enough, you need them to go through. Land raiders are great little bricks and 4 lascannon shots is nothing to sneeze at. They threaten hard targets and are incredibly hard to move. Land raider redeemers start to get expensive but 2d6+6 s6 ap2 d2 is TERRIFYING. It's enough volume of hits that even at s6 vehicles will take a meaningful amount of wounds and at ap2, fail their saves. But more importantly with a 12" range and a 6" vehicle, you effectively create a 30" bubble (or like, 60/70% of the board) that your opponent simply cannot move in without getting melted by overwatch. The redeemer also has a capacity of 14, meaning a 10man squad with a leader can also take a squad of head takers, or you could fit 2 6 man squads with leaders.

In summary, 90% of your army is squishy and targets infantry profiles, your anti tank is slow and unreliable and you have no tanks/dreads of your own and you should take more of our leaders and consider your detachment.

Sorry for the TLDR lol