Who doesn’t love strawberries, especially homegrown? I have quite a few plants growing in pots in the polytunnel. I leave them outside after harvesting and then bring them back into the polytunnel in early spring. I give them a good feed of general (liquid) fertiliser and then let the warmth of the polytunnel do the rest.
They have just started flowering so in a couple of weeks I shall stat giviing them a high potash feed (tomato feed is fine) to support fruiting. Its important to keep the polytunnel door open during the day so that bees can come in and pollinate the flowers to ensure fruit production. Alternatively, you could bring them out in the day or stroke the inside of the flower with an artist’s brush or similar. Keep them well watered as they grow.