Turning water “feature” into mini pond.

I have given up trying to keep my above ground water feature clean and decided to add some water plants. I have already attracted a couple of passing dragonflies and the hoverflies and bees have started using the plants to get a drink. Any ideas how to do more?

Marne la vallée, basically just outside Paris 🇫🇷, but definitely Scottish at heart.
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This nursery has lots of advice
https://www.watersidenursery.co.uk/tips-advice/combinations-of-plants-for-my-container-pond/
PS Love the sign, l have the same one. Unfortunately it would appear that weeds can't read