The government is by no means the crucial actor in this. This work is being done entirely by Academic Medical Institutions around the world.... the university medical centers and the medical schools around the world.... Oxford, Cambridge, Harvard, Yale, Johns Hopkins, Stanford, Karolinska Institute, even University of Alabama and the lesser known medical schools. The article in the OP is from Peking University, School of Public Health.

The governments only role in this is registering the clinical trials for official purposes. As far as funding, write to your legislator. The universities have to secure their own funding, and sometimes it does come from the government, and often it doesnt.

Here's the list of 309 ongoing clinical trials that are registered with the US government for regulatory purposes.... not to mention the hundreds of other studies that are being done to try to determine the causes of Long COVID (studies not involving the trial of treatments but the biochemical causes)

https://clinicaltrials.gov/ct2/results?cond=Long+COVID&term=&cntry=&state=&city=&dist=