The spleen is very much aided by liver management. Additional things you can do are:
Avoid cold, raw foods. They chill the spleen, which needs to maintain a very warm temperature because it deals with friendly microbes. They also chill the appendix, which is a furnace for culturing more friendly microbes. Appendicitis became much more prevalent when refrigerators and iced drinks became the norm.
Do lymph management. Anything that helps the lymphs helps the spleen.
Goldenseal and Turmeric, both considered blood purifiers, help the spleen.
If the spleen if exhausted from a sugar-rich diet, sour foods like lemon, lime, are cleansing and strengthening. If you do too much, however, they have a cold and depleting action on the spleen. You can tell you’ve crossed over from healthy to bad when your lips start peeling excessively and perhaps you get chills, or feel cold when you shouldn’t.
If your immune system/spleen are exhausted (catch every cold that comes to town, candida, auto-immune disorders), then be very careful when including raw foods in your diet. Make sure they are at room temperature and heat them up chemically with spices, oils, cream. Chew them very carefully. It helps to have your carrot juice with a slice or two of real veggies or even a cracker so that you are forced to chew and activate enzymes and warm the juices up.
If you want to drink the protein shake, try to let it come to room temperature. Avoid iced drinks altogether.
It’s much easier on the body if the raw veggies are fermented.