List-building help appreciated, trying to get my mess of units into a cohesive list

Alright, here’s what I’m working with, I have been using a 1k defense cohort list for a bit now but I’m trying to scrape my way up to a casual 2k list that still works. I know I will have to buy 2 or 3 more units to get all the way and would appreciate advice for that as well. I’ve more or less been just buying what I like the look of so far.

Dominus, Manipulus and an Enginseer/Archeologist

3×3 breachers with arc rifles & hydraulic claws

1×4 robots with mixed fists and guns

1x corpuscarii priests

2×3 serberys raiders

2x cybernetica datasmith

1x skorpius disintegrator with either gun

10 skitarii rangers with an arc rifle and arquebus

My main thoughts so far is to get 4 more robots and make a mixed lucius build, or to go mars and perhaps getting some more skittles and some las chickens. Nothing really has much synergy with my breachers unfortunately.

List-building help appreciated, trying to get my mess of units into a cohesive list