Congrats! Hope you had a good learning experience. Way to go!
After all this depends on your goals and interest, see also this thread: How to become an AI Engineer - #4 by Christian_Simonis
One of our mentors @saifkhanengr published a nice outline on LinkedIn how a possible course sequence can look like: check out this post !
In this post the Deeplearning specialization is mentioned as a possible next step after the ML specialization. This totally makes sense from my point of view! That being said, many fellow learners (>1 Million already) went for this proposed and quite popular Deeplearning specialization: Deep Learning Specialization - DeepLearning.AI
I would suggest to check it out and evaluate if this specialization and the content suits your plans, interests and also fits the field of your profession where you are working right now or your future job goals.
Best regards
Christian