It is a great advantage to have both in balance, and even more to have both in abundance. Persistence is necessary if you would be noticed. The old academic adage, publish or die is equally true for poets. This is not to be taken as a pun for those poets who achieve fame from their self destructive lives. Marketing is of value to a poet, but that often at least partial supplied by someone else.
Few poets are expert at marketing their own work without help.
Those who have a talent for marketing are much more likely to be noticed than those who don't. Selling your poetic work and services is the most likely way to a career in poetry, even a modest career. The readers who count are not often the same readers for each poet. Poetry, like other arts is a niche market. It is not a matter of reaching the market but your market.