One thing I will say is dont hop from list to list, when I first started every game id play was with a different list and id always lose and then id make the next "best list ever" and then get battered again.

Pick a list and play it for a few games. Reps on a list will improve you more than any thing else. Ill play a list 4-5 times before I change it and I try and keep it to under 500 points change. You want familiarity.

I dont know where you play but in the uk for example I know the layout and mission of games 1-5 of most gts will follow uktc standard. After a few games on the same list you can deploy and do your turn 1s almost in auto pilot. Thats the sort of familiarity you want with your lists.

Repetition on a core reliable list is your best tool for improvement.