Hello I'm courently playing as a goolock and I have heard that the entropic ward isn't very good and so I remade it:

You gain the ability to use your reality warping presence of your Patron to Change space time.        choose one of the following effects:

1. you can use your bonus action to gain advantage for your next attack action.(works on multiple attacks in one action)

2. you can impose disadvantage on the attacks of enemies equal to half you're proficiency bonus rounded up.

you can't use this feature again until you have finished a long rest.

That seems to powerful to me. Entropic Ward is not that powerful, but neither is Dark One's Old Luck (fiend patron).

Okay here is another Idea:

You gain the ability to use the reality warping presence of your Patron to Change space time:

As a reaction you can impose disadvantage and a hit-penalty equal to halve your proficiency bonus (rounded up) on the attack of an enemy within 30 ft. of you.(If this is to weak, use the full proficiency bonus). If the attack misses you, you have advantage on you're next attack, without advantage against the enemy.

you can't use this feature again until you have finished a long rest.

Probably fine.