from typing import List
from pytrends.request import TrendReq


def get_suggestions(keyword: str) -> List[str]:
    """
    Get keyword suggestions based on the given keyword.

    Args:
        keyword: The input keyword.

    Returns:
        A list of suggested keywords related to the input keyword.
    """
    if not keyword:
        raise ValueError("Keyword cannot be empty.")
    pytrends = TrendReq()
    pytrends.build_payload([keyword])
    related_queries = pytrends.related_queries()
    suggestions = related_queries[keyword]["top"]["query"].tolist()
    return suggestions
