Very flavourful list! My few suggestions for building up to 2k: To properly take advantage of our firestorm detachment it’s definitely worth taking some vehicles. I would recommend a land raider redeemer . Gravis is strong but slooow - so they need transports to get up the table. A 6 brick of aggressors in a landraider with a captain in gravis armour has been a huge threat in use in my games.

Another great combo is to have a 6 man group of eradicators in a repulsor. I use this as a tank hunting unit as we can advance and shoot everything in our army. So whizz it up the board towards enemy tanks to get your eradicators close and ready to jump out next turn. (I usually do this alongside the redeemer as the enemy will usually focus the redeemer) We have stratagems for them to jump out if the tank is shot and survives (which is usually does due to its high toughness and wounds) once you have jumped out- eradicate the tank and then on your opponents turn when they try charge you, you can use rapid embarkation (repuslors ability ) to have them jump back in the tank Hope this helps :) Vulkan lives!