Now you are focusing on the ministry of the elders. According to the New Testament every church in every city was to have its own plurality of elders, and their functions were (a) oversight of the assembly (hence episkopos or bishops) and (b) shepherding of the assembly (hence the spiritual gift of pastor or poimen). Pastors were not only be be gifted preachers and teachers, but also have a genuine care for each member of the flock, just like an actual shepherd. These would be the spiritual guides of those within that church. But today's evangelical practice of having just one or two pastors is not according to Scripture, and as a result there is no one-on-one shepherding. Also, the office of bishop was created to have one man over several churches, which is not what God intended. Christ is the Shepherd and Bishop of our souls, and every church was directly accountable to Christ (Rev 1-3).
The term elder is a translation of presbuteros which means one who is a spiritually and chronologically mature individual (and who meets the qualifications of pastor/elder /bishop). But the term for priest is hiereus
and that is never applied to elders as an office. Because all Christians are within a Royal Priesthood (see 1 Peter 2:4-9).
The modern versions have mistranslated "kings and priests" as "a kingdom of priests" (Rev 1:6) but the kingdom is the Kingdom of God, with Christ as King of kings, and all God's children as kings and priests.
And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the Prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood, And hath made us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen. (Rev 1:5,6)