You're a Workspace Owner, responsible for setting up your company's Slack Business+ workspace for the...

Use Workflow Builder to create multiple workflows that allow users to request the necessary approvals from a #help-slack channel.

Do nothing, as Slack's default settings automatically route approval requests to Workspace Admins through a Slackbot direct message (DM).

Post and pin a message with a request template in the #general channel that asks users to submit their requests in the #general channel.

Set up a #admins-approval channel, and change the settings for each request type to route approvals to the channel where Workspace Admins can approve.