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At a fundamental level, you're not bringing enough firepower. As a new player, a good rule of thumb is to fill every available slot with an assault weapon, and to give every non-mobile squad a heavy weapon.

The best IG heavy weapons are lascannons (which you have) and autocannons. Assuming you're using plastic Cadians, it should be possible to use the heavy weapon box to make way more than 3 heavy weapons teams. If you're short on bits, ask around at your local store, and you may find a helpful veteran player who can give you some. Special weapons are a rarer commodity, but a lot of sprues these days are coming with extra meltas, and the IG box comes with flamers and grenade launchers, so you should be in good shape. A good semi-mech army also needs more than one Chimera, but that can come later.

If I were you, I would also drop Pask + the Vanquisher completely in favor of either stock Russes (w/o sponsons), Demolishers, or Executioners. I'd also consider dumping Creed, since he costs a lot of points; you can buy two CCS for less than the cost of one CCS with Creed. I'd also have a long-term goal of ending up with a Manticore instead of a Medusa, but I realize the Medusa conversion is far easier with a Basilisk kit.