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MCamb
Can't remember which shifter that is but frequently fix shifters that have stopped ratcheting up or down due to the little clicker (up or down, sometimes both!) sticking due to old grease/time/temperature.
Flush with kroil/gt85/brake cleaner etc, use a dental pick to stimulate the little clicker/spring, don't go all the way to its limit of travel or risk breaking the spring as then its scrap. Just flick it back and forth about 20 times until it moves well enough on its own, then use a pick to stick a blob of nice green shimano type grease on it.
Get it all the time when folk drag 90s/00's hybrids that have been sat in a shed for 20 years. A few days soaking and a bit of flicking/new grease, often work fine again for many years.