If you are doing the obliterator challenges, stack up on stamina foods and do glide by bomb arrows, work on getting a 5 shot bow from the strongest lynels for add explosivity.
Make use of items such as majora's mask which can let you get in to the camps and get the lay of the enemies even stealth armor can help you in escaping or sneaking in and stealthstriking, Stasis can be use to show if any sentries are about if they are stasis them then shoot them in the head.