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@hullian
As well as the specific recommendations already given, there are also many online converters. Googling 'compress mp3' gives several options on the first page of search results.
Ideally you would compress from a lossless format (e.g. WAV, FLAC). Generally, taking a lossy format (like MP3) and further compressing it will not give as good a result. I am not sure how much difference it makes in practice, particularly if it is just voice.