The visa waiver program allows you to enter the US for up to 90 days per visit. There is no rule about 180 days. Immigration officers may question whether you are abusing the program by using it to spend too much time in the US, but that seems extremely unlikely in your case.
You do not need an alternative, but you can always apply for a visa.
Your visa was invalidated by law when newer machine-readable visas were introduced years ago. You can no longer use it.
Credit:stackoverflow.com‘
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