Wife took both my kids and left to her house, and refuses to send them to me.

Since I am a doctor, at the onset of the COVID pandemic, my wife left for her house stating chance of COVID in my house since I am practically exposed to COVID everyday as a doctor, and took both the kids with her since there was no school then. However, a year later, she refused to return and also got admission to the children in a local school. Her father called me a fool for pursuing my doctor's job at a "very low" salary at my place, which is in stark contrast to my family theme of public service and not how much we earn, and also vehemently shouted at my parents and me saying she was never "cared for" nor was she given proper "food to eat" during her stay at my place. This and the added stress of excess work as a doctor during this COVID pandemic has made me forlorn. I visited their house again a few times and cajoled my father-in-law to atleast allow me to take my kids home with me for one week and assured them I would return the kids in that time, but my wife said she doesn't trust us to do so. I am only allowed access to my kids in her presence in her house, and not even allowed to take them out. My parents are emotional wrecks now after the unexpected verbal torture from her parents saying they have not "raised me properly", so i have asked them not to get involved in this anymore. I have tried to talk amicably to them one more time, to no avail. It has been two years now since she left. This is impacting my work life since I miss my kids, and I accidentally even wrote wrong dosage of some medicines before my junior resident adroitly pointed them out to me. After all the altruistic public service I have done during this pandemic, it is deplorable that I am going through this. I requested her bank account details so I can transfer some money to her for expenses regarding the kids, but she refused to share it with me (probably to prove in court that I haven't given her any money since the separation, if it gets to that) and only accepts school fees as cash (without any evidence). I have told her that I would give her a mutual divorce if she wants, but she refuses. But what to do regarding the kids? They need a father's presence in their life, and I cannot just quit my job and move to their location either (since I have worked with long term plans here for several years and picked up a decent practice, and I would have to start from scratch all over again if I quit). At the moment I am visiting them whenever my tough onerous work allows it, without compromising my patients in any way (for a doctor, work always comes first as it is a matter of life and death). What do I do next?