Hi Ren, the problem of recurring flu is increasingly serious here in Italy too.
As you well know, TCM is also a preventive medicine, in this sense already from the month of August, August 8th the autumn period begins, metal, you should take astragalus which supports the immunity of the respiratory tract, its target organ is the lungs. Together with astragalus, you should make herbal teas of chrysanthemum flowers, which tend to eliminate the heat that, penetrating the body, in the transition from summer to autumn, create latency conditions of an inflammatory nature. You will also need some light applications of moxa (cigar) on points 36st, Gv 14, tr 17-16-15, Li 11 and 4.
If you are at the beginning of the flu take "Jade Screen Form-Yu Ping Feng Pian" tu stop the flu.
During the days of flu you must try to get rid of phlegm, you need inhalations but also intestinal probiotics + N-acetyl cysteine, as already recommended in one of your links, you also need to keep your throat disinfected with scrubs that can contain water, salt and lemon. In the case of fever there are acupuncture points to bring it down but in my opinion it is better to let the fever run its course, unless it is very high.