Congratulations!
The common job titles that could help you gain more project management experience are Project Analyst, Project Coordinator and Associate Project Manager.
You can also lead and manage projects within your own area of expertise and gain valuable experience without the title of a Project Manager. This experience can still contribute to developing your project management skills and may count toward the experience required for PMP.
Also volunteering for roles like project coordinator or project manager within or outside the organization or a PMI Chapter for business improvement initiatives, can significantly help you gain experience to meet PMP qualification requirements. I hope this helps.