D dimer test result is high (abnormal))

My father was diagnosed with covid 19 in CT scan Corads 4,he was admitted to hospital as he suffered from vomitings and fatigue,he was treated with remidesver and now he got discharged and doing good. (20 days back). 10 days back when we took D-DIMER TEST the value came was 850,as doctor had given medicine for blood clots for only 5 days we have taken same ,now after 10 days when we have taken test of D-dimer the value is 2300 doctor gave few medicine but I am really concerned that will tablets be enough or do we need to take any injections,kindly inform is it possible to reduce the values using medicine,or need to get any injections kindly suggest. Ecosprin -Av75 Apixaban-5mg Zolsoma-5 ( this are the tablets given )