Bybit starts to release a fully new copy trading on 24th June 2023. It is released gradually by end digit of uid. You can select to upgrade to new copy trading when you are applicable. Once upgraded, please note below points:
You will be allocated a new sub account, which has USDT Perpetual copy trading ability
Create a new api key for that sub account, and grant it "Contract" permissions.
You are no longer permitted to use Copy Trade V3 API. Alternatively, you can go to Contract V3 or V5 to trade, and V5 API is recommended.