For what it is worth you should have blood tests with kappa lambda ratio and see Hematologyoncology to decide if you have pre myeloma.
I have mgus the kappa is not as high as yours but I got mine down from 2.9 to 2.2 with healthy plant based diet low to no sugar it might help you although you have to be careful if your kidney is struggling some veggies can make that worse. Keep up your exercising and stay hopeful!!