A big part of being humble has to do with valuing yourself appropriately.
If you overvalue yourself your ego will increase – which will create an illusion that the world revolves around you (and when it doesn’t – it’ll be a real problem).
If you undervalue yourself, you will constantly doubt yourself and this will hurt your ability to achieve your dreams (after all if you are unworthy, why should you try?).
Valuing yourself means to find the right balance. Not too much self importance and not too little.