Dude, you’re having all kinds of problems.
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http://gobittest.appspot.com/Address - with this tool you can skip step 0 and paste your public key on step 1 in order to get it’s address
In order to get access to that private key you can use the following tools: - https://iancoleman.io/bip39/ - Do this offline for safety. Here you can paste your wallet’s seed phrase and rediscover all your addresses and private keys. Find the address that you discovered on the step above and get it’s private key