Long stems, getting top heavy

A question from a fellow grower;

I think I might need to think about transplanting to bigger pots. The stems are long and spindley and they are getting top heavy at 5-6 cm. I’ve gently placed small supports to help them continue to grow stronger, I hope. Any advice on any of this?

Move lights closer !!!

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Do you have an oscillating fan moving air around and causing movement for your plants. This strengthens the stem to provide support.