Wether you are in bash or zsh, you can use the ! operator to recover arguments of your previous command:
If we take: echo a b c d as an example
!$– the last argument: d!:*– all the arguments: a b c d (can be shorten!*)!:1– the first argument: a (same as!^)!:1-3– arguments from first to third: a b c!:2-$– arguments from the second to the last one: b c d
This last point answer you question, you can take the last part of your command.
Note: !:0 is the last command executed, here it would be echo in our example
The corresponding documentation can be found on the gnu website, the whole context gives much more resources than this comment.