The expression "kind wishes" is a common way to express a friendly and polite sentiment. However, there are many synonyms that can be used to convey similar meanings. Some alternatives include "warm regards," "best regards," "sincerely," "with respect," "yours truly," and "humbly." Other options include "all the best," "take care," "be well," "sending positive thoughts," "blessings," and "hope this finds you well." No matter what synonym you choose, the most important thing is to express your good intentions and genuine concern for the recipient.