You can use the Faucet, as described in the documentation here :
go to https://faucet.tzalpha.net/
get a faucet file tz1__xxxxxxxxx__.json
Activate it using tezos-client activate account alice with "tz1__xxxxxxxxx__.json"
transfer or delegate the fund to your baker ...
You could use Docker's cp command as a workaround.
In your case it would be something like:
docker cp tz1Zvjxu9Vzt76uRLtV6CHZMPu1zKA5YV4QX.json alphanet_node_1:/home/tezos/tz1Zvjxu9Vzt76uRLtV6CHZMPu1zKA5YV4QX.json
./alphanet.sh client activate account myfaucet with tz1Zvjxu9Vzt76uRLtV6CHZMPu1zKA5YV4QX.json
The command tezos-client activate does not exist on mainnet. Are you positive that you launched your node against one of the test networks? The faucet is only for the test networks.
You may need to repeat your node setup and pass --network carthagenet when starting it.
Your node is not sync'ed. (I agree that the error output doesn't describe the problem)
(timestamp: 2018-09-08T22:03:12-00:00, validation: 2020-10-28T09:15:10-00:00).
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