What should I get after the Necron Host Battleforce?

Hey everyone, I’m a new player and the Necron Host Battleforce is my first Warhammer 40K purchase.

Around me, most people play Kill Team and 1000 point games, so my goal is to build a small but enjoyable army that works well for those formats. The box already gives me a good starting point, but I’m not sure what the best additions would be. What would you recommend adding after this box?

I Have;

• 20x Necron Warriors
• 6x Canoptek Scarab Swarms
• 5x Flayed Ones
• 3x Ophydian Destroyers
• 1x Canoptek Doomstalker
• 1x Catacomb Command Barge