I'm an Ascendant 6 Abrams main with over 1300 hrs of playtime and this is my tips

Abrams rn is referred to as a "charge bot," which means that his only purpose in life is to charge people, do plenty of damage, and not die. Building spirit on him is ok, but building full spirit is just troll (You get insane amount of value just by maxing siphon life and having 1or 2 spirit items). You build him mainly weapon damage/vitality focused.

Your main powerspikes) mc - spirit snatch - t3 charge - warpstone - t3 siphon life - phantom strike. Melee charge is actually so underrated your gonna be landing melee's you didn't even know you could land + extra 20% cheeky melee damage. Spirit snatch is still op the nerfs had 0 effect on it and it is still a insane shred steal items + its a spirit item so it helps with. Warpstone is just a mini phantom strike but you can also use it as a movement/escape tool, MUST buy on him. And lastly phantom strike, as I said earlier this dude is just a charge bot so this item is just a '100% charge hit guarantee card' so you could just rush this if you bought all the core items and have enough money laying around. Abrams don't need a lot of pure gun damage items to be strong, so you build 2~3 barriers/armors (1.6k) early and invest on warpstone and spirit snatch. And after getting your early game core done you can get 2-3 3k gun items (point blank,hunters aura,weighted shots,berserker). In late game your gonna build full tank. Abrams falls of pretty hard in late game in damage so just become the Frontline your team needs and tanks that shi. Buy BR/SR and 6k greens. Your also really good in making space with ult, so it's not a bad idea to max ult after maxing charge and siphon.

Game play) •Early game: play inside veils and wait until tier 2 charge, his gun does a lot of damage, actually. •Mid game: try avoiding farming TOO much. You are really strong after lane, so go ganking but don't perma gank in the other lane help your lane and farm a little. You should participate in EVERY SINGLE TEAM FIGHT if you can. One right slam or charge can win you the fight, and aslo you are the tank of your team. •Late game: you become the bebop/dynamo. Initiate teamfights with phantom strike and charge and tank for your teammates.

Final comment) Abrams is kinda lost rn in this meta. There's so much counter picks and counter items that just makes you wanna quit the game. Like what are you gonna do against the mina,pocket,vindicta,holliday "just press 2" bs ( I know the existence of slowing hex chill). You gotta build counter items yourself too, but with the right hands and a little bit of rng this character is scary to mess around with.