Sorry for your grief. I found the following article that contained some ideas.
https://orthoinfo.aaos.org/en/treatment/revision-total-knee-replacement
I'm not a doc, but I'd want to be damn sure the prosthesis is installed properly and nothing has deteriorated or infected. The article emphasized weight loss which I found to be very helpful. If my weight exceeds 170, pain increases. Get back down to 170 or below, pain decreases (I'm 5'10"). The second, very helpful idea reqd building up the muscles that allow me to stand on my toes and my heels thereby relieving the knee of some of the workload walking up stairs. My third advance took place after I switched docs. The second doc treated the issues differently, she was much more patient & thorough. Fourth, I just got the results of my MRI which the second doc used to determine damage to a tendon the first doc cut thru during my TKR. I am scheduling "tenex" to see if that will mitigate the damage done to the tendon. Fifth, I use knee muscle building machines at the gym but I don't expect the TKR knee to bend as far as the non TKR knee. Suffice to say, I use the machine to build muscle but both docs told me to AVOID the machine in the photo I attached. Last, instead of ibuprofen, the sec doc prescribed Nabumetone which is easier on my stomach.
I wish I could offer more.