There are several synonyms for the phrase "professional help". One common substitute is "expert assistance," which implies that the person providing the help is highly knowledgeable and skilled in their field. Another option is "specialized guidance," emphasizing the fact that the help being sought is tailored to a specific issue or difficulty. "Consultation" is another synonym that suggests a professional approach to problem-solving. Similarly, "advice" or "counsel" imply that the help being given is based on experience and expertise. "Support" is also a good option when referring to someone who can offer emotional or practical assistance, particularly in times of crisis or difficulty.