In case this person never sees your question, I know of only two ways (I'm not in the medical field, just enjoy reading about health matters, especially my own):
a. diuretic, or
b. improving heart function so that the kidneys work better at their job of concentrating impurities in the urine. This may be surgery such as replacing or augmenting a valve, even the diuretic might help with improving heart beat if there is fluid in the pericardial sac, and then the heart beats better, or maybe there's bradycardia/arrhythmia that makes the heart function sub-optimally, and if that is the case, drugs can help, perhaps catheter ablation, or a pacemaker as a last resort.

Hospitalization with a change in meds, and IV diuretics. I was in hospital for a week and went into Vtac so they rushed me to ICU in the Heart Hospital at our Med Center. I was put on Entresto and Eliquis, but I changed back to Warfarin as Eliquis is very expensive. Entresto has a Patient Aid program. I came home 52 lbs lighter after a couple of years of no doctor listening to me, including my cardiologist. I had been told previously that I had pneumonia as to why I couldn't breathe. When I arrived at the ER with Afib, one Dr also told me I had pneumonia. Then a young and caring Dr came in and said that I don't have pneumonia. I let him know that I have Interstitial scarring and that is what he said they are basing it on. He had me admitted then. Upon discharge, I was told if I gain more than 2-3 lbs daily, I should go to the ER. I have done both the ER and yesterday, my PCP(actually his Nurse Prac). I have gained 32 lbs back in just a few days. Nothing done whatsoever. She never even checked my meds. nor called in my pain meds and it is the weekend. I can't take Ibuprophen due to Stage 4 severe kidney disease.
I miss the days when the dr. came in and actually looked at you before going on to a computer. All I can say is make a nuisance of yourself. The squeaky wheel gets the oil. If your health provider or insurance has a Critical Care Team, get them in on the action.

Diuretic, when I had heart failure it was standard treatment to be on one to help remove fluid. A weak heart is why you may be retaining fluid. Our hearts pressing against our lungs is how fluid is removed from the body. When our hearts get weaker it doesn't do the job as well. So maybe discuss that with your Cardiologist.