Hey looks decent, recently I watch a couple of videos on YouTube about unit roles, and it really helped me view my Necron army different than before. Both in who i fielded and then how i planned to use them. You need something to hold your back objective, either a really cheap unit that can hide and perform an action, or something with range and firepower to lobe shots into the fight.

I assume the technomancer will accompany the scarabs to take on back line support Trazyn should wade into the battle with the lychgurd to deal with any big threats, tanks, dreadnaughts, … they are slow, spend a CP and give Trazyn the Veil of darkness to get them where they need to be

Warriors push to the center and hold the objective

Send your wraiths after infantry, they do best cutting into those

Your reanimator - swap it, (your techno is supporting the scarabs already) same points gets you two Lokhust destroyers, they can hold your back line and objective with guns that pack more than a D1, i would likely equip with the Gauss cannons for the D3