If you can raise your arm up or have a helper - if not painful for you.. they can hold arm up and do light strokes toward the core of your body.
that is the main way to do lymph drainage.

I do mine in the shower, I can still get my arms up and my ROM is OK.

My arm pits will get puffy, tender and sometimes a pinchy feeling - like if I am really into a book and read for more than and hour at a time.
If I prop with a pillow I can read longer...