Yes. One ARRIVE account can act as both a host (someone who books performers) and a performer (someone who gets booked) — there's no need for a second login.
If you started as a host and want to perform, look for Become a Performer in your account menu. You'll set up a performer profile and at least one service, connect payouts, and submit for review. As with every performer, your profile and services go through admin approval before they're live.
Once you hold both roles, a switcher appears in your account menu so you can move between hosting and performing. Your events, bookings, messages, and payment history all stay under the same account.
A couple of notes: your performer side only becomes bookable after it's approved, and switching roles changes which dashboard you see — it doesn't create a separate account or separate login.