What would you do if a client constantly tries to avoid you?

"There are a couple of ways that I've tried to stand out to clients when they seem like they're avoiding me or when they become unresponsive. Instead of calling them again, I'll shoot them a follow-up email. In the email, I'll include social proof, like testimonials from previous clients. Sometimes, I'll add links to success stories that show how our product or service positively impacted the clients' bottom line. Then, I'd sign the email simply with my contact information. In some instances, it may be a waste of time to bombard the client with too many follow-ups. Also, if there's a next best person I can reach out to, then I'll try them as well."