Microsoft will be retiring the PL-100 certification and course in June 2024.
You will be able to renew the certification before the end of June, and the exam and certification will remain valid for a further year beyond the date you took or renewed the certification.
The App Maker exam has always been a little bit of a strange exam as it overlapped some of the other Power Platform exams and was aimed more at the business maker rather than the IT professional maker.
Microsoft have created Applied Skills credentials that focus on actually real-world skills. There are three applied skills that map onto the tasks covered by PL-100 that you could attempt instead.
- Create and manage canvas apps with Power Apps
- Create and manage automated processes by using Power Automate
- Create and manage model-driven apps with Power Apps and Dataverse
If you still want to gain a Power Platform certification, then look at either PL-200 or PL-500.
Vlad has made a video that gives more information.