Is it too late to work with an agent?

Well no agent is going to want to shop a book that's already for sale.

Work on something new. Those books are totally off the table for an agent.

I agree with the others about writing something new.

Out of curiosity, what's your definition of selling fine?

Agents and publishers want first rights. You relinquished first rights when you self-published, so these books are pretty much done now, unfortunately.

However, if you have mind-blowing sales (50,000+, and this is probably conservative) an agent may be interested in trying to sell print rights.

Becca_H said:

However, if you have mind-blowing sales (50,000+, and this is probably conservative) an agent may be interested in trying to sell print rights.

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Well, actually, it's more like around 5,000 to have the possibility to interest agents.

Terie said:

Well, actually, it's more like around 5,000 to have the possibility to interest agents.

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This. And I would leave the book up for sale. If there is interest from publishers, they will ask you to take it down if you go into a contract with them. Otherwise, leave it up and let the agent see how well it's selling.

If you can back up a strong book with strong sales, it already has a platform established. If you're moving 5,000 books a month, there are probably a lot of agents that would be interested. If you are moving 50 a month, not so much.

What these guys said - an agent isn't going to be interested in your self-pubbed books unless they're selling like hot cakes, so wait until you have something new to shop around before querying.

You can leave the existing books up, though - unless they're getting awful reviews, they're not doing any harm to your career.