The word ‘humble’ can be used in two forms: as a base adjective and in its comparative form. Both ‘humbler’ and ‘more humble’ are grammatically correct, but their usage can vary depending on context.
‘Humbler’ is the standard comparative form of ‘humble’ and is often used in casual speech or writing. For example, you might say, ‘He is a humbler person than he was before.’
On the other hand, ‘more humble’ is another way to express the comparative degree, and it might be preferred in more formal contexts or when you want to emphasize the quality of humility. For instance, you might write, ‘She is more humble than her peers.’
Ultimately, whether you choose ‘humbler’ or ‘more humble’ depends on your personal style and the level of formality you wish to convey.