VS Code Terminal Keybindings to enable Ctrl+` to switch back to the editor and Shift+Cmd+] to move between active terminal sessions. Press cmd+shift+p and type keyboard to find Preferences: Open Keyboard Shortcuts File. Add the following to the keybindings.json or update the existing file and save it.

VSCodeTerminalKeybindings.json

// Place your key bindings in this file to override the defaults
[
    // Toggle to terminal focus
    {
        "key": "ctrl+`",
        "command": "workbench.action.terminal.focus"
    },
    // Toggle to editor focus
    {
        "key": "ctrl+`",
        "command": "workbench.action.focusActiveEditorGroup",
        "when": "terminalFocus"
    },
    //cycle to next terminal session
    {
        "key": "shift+cmd+]",
        "command": "workbench.action.terminal.focusNext",
        "when": "terminalFocus"
    }
]