In all my humbleness is a phrase used to convey modesty or an air of humility, often in response to a compliment or praise. To express the same sentiment, one could use phrases like 'with all due modesty', 'in all sincerity,' or 'with all humility.' Alternatively, one can use other phrases like 'in all candor', 'with all honesty', or 'without any false pride.' These phrases capture the idea of being genuine and truthful about one's abilities or success. Ultimately, it is important to remember that humility is a virtue that is respected by society and can help to maintain harmonious relationships with others.