Hey Chad…
I think it would be useful/healthy for “21st century Christians” to try and NOT reinvent the wheel in terms of God’s redemptive measures and simply live-out the reality of fulfillment in terms of… ‘witness’ (God has done it: WE don’t have to TRY and make it happen), ‘worship’ (thankful hearts: acknowledging His grace to all), ‘works’ (practice the golden rule: “love thy neighbour”).
Mic 6:8 He has shown you, O man, what is good; and what does the Lord require of you but to do justly, to love mercy, and to walk humbly with your God?
Or let me put it like this as per… Witness – Worship – Works
From a fulfilled perspective… does God still call and move men’s hearts post Parousia? I believe He does, but NOT in terms of redemption from the sin as THAT has already been fulfilled on God’s level in Christ (Jn 1:29; Heb 9:26; 2Cor 5:19 et al). But if in terms of witness, worship and works then by all means YES, God can and does move peoples’ hearts in service of Him and to others.
Israel’s age of covenant fulfilment (AD30-70) did not negate the other or further workings of God. Such workings are clearly demonstrated in the bible through those who were NEVER under the likes of the Abrahamic covenants, old OR new. For example: 1) the Gentile king and priest Melchizedek (worship). 2) the Gentile messianic king Cyrus (witness). 3) the generous gentile Cornelius (works).
NONE of these are recorded as being part of “the covenant people of God” yet ALL performed the will and works of God in a more than affirmative ways under His hand of blessing.
Acts 10:34-35 Then Peter opened his mouth and said: “In truth I perceive that God shows no partiality. But in every nation whoever fears Him and works righteousness is accepted by Him.