Python PDF dump and compression function requirements, paid

I am a designer, and I usually need to transfer a lot of pdfs in my work. The workflow is as follows:

1. Merge N pdfs into one pdf, (N is generally more than 100 pages, the volume is huge, a single file is the design content, and merged into one report file)
2. Save the merged pdf as JPG, (for design fees and copyright reasons, the original pdf needs to be converted to image format for vector content)
3. Compose JPG into a pdf and compress to reduce file size (reassemble into a report file and compress to suitable and send size)

Although this matter is simple, in the face of hundreds of pages of pdf each time, the merging and compression time is slow, and attention needs to be paid in the middle. It is inefficient to perform various operation steps.

I'm just new to python, and I need to be able to input a file address, and the internal pdf will be merged in order, saved as jpg, and then merged and compressed.

I hope there is a python code that can help me implement this function, and a more detailed installation method of the library, thank you!