For he shall give his angels charge over thee, to keep thee in all thy ways. They shall bear thee up in their hands, lest thou dash thy foot against a stone. Psalms 91:11-12 KJV
The angel of the Lord encampeth round about them that fear him, and delivereth them.
Psalms 34:7 KJV
This scripture says that the angel of the Lord encamps around them that FEAR THE LORD and delivers them.
It can be inferred from this scripture that another sure way to activate angelic protection in your life is to FEAR THE LORD! To fear the Lord simply means living according to His word and living to please Him only.
Daniel feared the Lord and he enjoyed protection from the mouth of hungry lions.
Then said Daniel unto the king, O king, live forever. My God hath sent his angel, and hath shut the lions' mouths, that they have not hurt me: forasmuch as before him innocence was found in me;and also before thee, O king, have I done no hurt.
Daniel 6:21-22 KJV
Daniel entered a higher realm of protection because he said innocence was found in him and he had done no wrong.
There are levels of protection. As much us we all are due angelic protection, the level of it is determined by how much you fear the Lord.