Adjusting for missing cost basis

Describe the problem:
I
I have multiple transactions missing purchase history, cost basis. Some with larger values that could be adversely affecting my balance. It’s difficult to figue the original cost basis because I’ve moved crypto from various accounts into the KuCoin exchange. and these assests were accumulated over time at differnt price points. As such, it’s difficult to track down on which exchange they were purchased becuse they were acquired over time at different price points on diffent exchanges, and now combined in the KuCoin account. Is there a way to manualy reconcile this?

Which exchange/wallet is this regarding?
KuCoin

How did you import data into this wallet?
CVS files.

What have you tried to fix this so far?
I did the original input via API, and then manually using the CVS files

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