My Lo (11m+) got RSV and admit hospital twice. How to speedup the healing process

Hi mommies.. need an advice.. My lo start cough 11 Jan.. and see doc eat medicine until 17 Jan and admit hospital 7days (nebulizer, fisioterapy, spray and drop into nose and got medicine). have once section for suction through his nose. Aftrr discharges, we do the nebu, spray n medicine same like they taught us. 2 days at home better. 28 Jan hav a heavy breath and fever 38.6 and admit again in diff hospital (until now). Doc said he got RSV.. at here he got the puff , spray and drop into nose and less medicine than prev hospital. Now he do suction 3 times (nose and throat) and hear the voice is diff.. like hoarseness.. and his oxygen level is still below 95 and ever 86 the lowest. We r really dont know what to do.. is it safe to do the suck? total ady 3weeks + Has anyone ever been before? how’s the progress until your lo back to normal? Thanks in advance!