Answer:
The purpose of having Beowulf describe his own great deeds is to show that he is brave and has no reluctance in dealing with anyone or anything. This allows the readers to see how confident Beowulf is and paints a picture of a truly deserving epic hero.
Step-by-step explanation:
The epic narrative of "Beowulf" is a tale about the various great deeds and victories of the titled character Beowulf. He himself narrated his own victories and his actions.
The writer makes Beowulf describe his own actions and great victories. In doing so, the character of Beowulf shows that he is confident of his own capabilities, and he knows he is a great warrior too. Also, when someone describes himself in such a way as Beowulf had done, it only means that he is not shy of flaunting and declaring his bravery and strength to others. This also makes the readers see and know how confident the hero is and how worthy he is of being labelled an epic hero.