I would say "just wait". The population of frogs and newts will expand to the capacity of the pond in time. Even if you added animals or eggs or daphnia, I suspect that the final population will eventually end up to be the same.
I agree with Jennifer, just leave them to it, and the population should expand by itself.
You could try making your garden more amphibian friendly, giving newts and frogs more places to hide and feed when out of breeding season.
Log piles, rock piles, compost pile, ground cover plants etc.
honestly anything like that will work, i have a friend over in england who said he saw bunches of new morphs after he peeled back torn padding on a wrecked sofa chair sitting in a breeding pond, not that i recommend this as garden decor.....
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