As far as tackling karma to resolve it, some spend a lifetime dealing with current and past karma, usually seen wearing yellow, red or orange robes. For the rest of us, there is Christ, who will not send you to hell, get rid of that funny idea. There are too many scriptures Pauline or not that address this point. However, as Mider said, there is a way to tackle it, generally self acknowledgement of past events, thoughts or words that generated bad karma. List the karmic transgressions. Try to find the people involved and make amends and an apology. If they won't listen to you or give you the time of day, then silently bless them. Look for people who are on the edge and worn out and help them in some way to take the edge off. Do general good deeds and random acts of kindness, strictly for the purpose and intent of resolving karma.
If you need to take this convoluted path. God has a very simple path outlined,
Now, you may not share my spiritual views or ideas, you may think they're offensive or silly.
It boils down to my enemy enemy is my friend. If these attackers have an advantage over you in some way, then address that and ask them why they are holding this over you. If it is in retaliation or reaction of. negative past event, then try to resolve it right there.
My best advice running on fumes and negative brain cell counts.