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Rejection is part of the writing process. The vast majority of poets, even well-established poets, were rejected many times throughout their career. If you receive a rejection, try not to ruminate over it. Send out a lot of poems. Publication is, in many ways, a numbers game. While you may only get a small percentage of what you send out published, you'll gain a lot of publications if you're submitting frequently. On the day you receive a rejection, try doing something to distract yourself. Read a book, go for a bike ride, take a walk, or take a warm bath. Engage in some self care to help you mourn the loss. An agent can be great for a literary career. However, very few agents are willing to take on poets. Only the absolute best-known poets receive representation from an agent. Even some well-known poets operate independently. While you may dream of having an agent of your own, accept that an agent is not a reasonable option, especially early on in your career. Sometimes, it comes down to who you know. Even in the literary worlds, knowing an editor can help you gain an edge over the competition. Read the editorial board of various journals. If you recognize a colleague from graduate school, undergrad, or from anywhere else, get in touch. Knowing someone on the inside can help your work get read. For larger journals especially, a lot of work is read hastily or not at all. Tenacity is important if you want to be a poet. There will be many setbacks along the route to publication. Do not be discouraged. Keep submitting your poetry, despite rejection, and you will eventually find success. Tenacity takes practice. It may take quite a few rejections before you're able to bounce back with ease. See rejections as a chance to practice become strong and tenacious rather than seeing them as setbacks.
Take rejection in stride. Accept getting an agent is not always practical. Try some networking. Be tenacious.