Next Serving of Section 173 Notice After Inaction

I served a 173 notice but didn't act on it within two months. When can I next serve the notice?

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Landlord No Reason (Section 173) Notice

Under the Renting Homes (Wales) Act 2016, how possession is sought changes for occupation contracts. There is a "no reason" section 173 notice (comparable to section 21) upon giving six months' notice