everything was fine till yesterday when i started playing with trims, i think i moved the throttle trim and now it wont lift, with just lift up few cms and vibrate, its also drifting to one side, to make to stable i have to trim ele and ali all the way to up and right respectively

re caliberate pots and which quad

Do the following steps

1. Read the manual
2. make sure battery is fully charged, try with another battery if possible.
3. Reverse all adjustments back to way they were.
4. check all props for cracks
5. check to ensure there is no binding between motor and prop and the setup is moving freely
6. if the above does not resolve your issue, then - as per the manual re-calibrate (i.e. - switch on the quad then tx then move both sticks on tx in a certain direction and watch the quad to do some quick blinks)

done... but it still doesnt work
its wltoy v959

i messed up the trims, cant set it back,
any way i can reset it?

Remove tx cells and switch on the quad. Then turn on tx.
After that increase throttle until you get desired thrust. If not , push throttle trim up and up to max.
This would solve your problem