You need to repost the task to receive offers and find a new Tasker. Reposting the task is easy - just select More Options on the task then choose Post a similiar task (on mobile and web browsers) or Copy task (on the app).
If you already have a specific Tasker in mind for the task, you can notify them that you're interested in receiving their offer. To do this, follow the below steps:
1. Go to the Tasker's public profile page
2. Click Request a Quote on the right side of the page
3. Choose the task that you'd like the Tasker to make an offer on and write a short message. You can also choose to create a new task from here to specifically ask this Tasker for their help.
4. Once you've done this, the Tasker will receive a notification to let them know that you want their offer on your task.
Please keep in mind that this doesn't guarantee that a Tasker will make an offer or be able to do the task you've posted. However, posting a new task and requesting a quote will make the task public, giving you the chance to receive offers from all interested Taskers in the marketplace.