When C19 was at its most aggressive, a very highly regarded top A&E chest consultant, strongly recommended that people who can be vulnerable to any chest conditions, will greatly benefit from taking a daily dose of one single "Ultra Vitamin D 1000 IU" strength to help boost their immune functions, especially in the winter months.
As you have required three courses of antibiotics to help shift that infection, your chest / immune system could do with a bit of a helping hand right now.
Of course your wife will know a lot more about these things than I do Miles.
But if you are anything like me ( stubborn ) I tend to disregard good health advice from her and live to pay the price at a latter date ? .
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