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Could be fungus gnats though our occasionals seem smaller than what’s photographed.

What’s worked for us for long term control of soil born pests is a combination of bottom watering and a layer of coarse sand for mulch for our indoor plants. Playground sand is too fine and can prevent proper gas exchange in the substrate but builder’s sand works well. It’s probably less expensive to call a landscape supply place near you and fill a bucket than to buy it in a box store unless you have enough indoor plants to use 50lbs/22.7kg. We use a large clay tray pot for the bottom watering and then everybody goes back to their own tray after a drink.

Fungus gnats in particular lay in wet soil, and not very deep. A few mm of sand keeps them from finding any hospitable place to lay their eggs. The bottom watering helps prevent any disturbance of the sand mulch which might reveal wet soil.