Ask What role does follow-up communication play in retaining freelance clients, and how often should it be done?

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I recently finished a few freelance projects, but my clients never reached out again. I'm wondering if I should be doing something different. I've heard that following up can help keep clients, but I'm not sure how it works. Should I just check in and say hi? Or should I offer them another service?

I don't want to annoy them or seem desperate, but I also don't want to lose good clients. How does follow-up communication help with client retention, and what's the best way to do it?