In Turkey, the electoral threshold is set at 10% which allows for stable governments/coalitions but creates a lot of wasted votes. On the other hand in the Netherlands there is no threshold at all which means fewer votes are wasted, but it's harder for the Dutch government to form a coalition.
But why not combine the two to achieve both at the same time? Set the electoral threshold at 10% but run the election as proportional representation with a single transferable vote. This way very few votes will be wasted, but at the same time it will be much more likely that a strong coalition could form.
Or perhaps there are already countries which implement a similar approach?