To some this poses a problem – why the silence post Parousia? – what happened after AD 70? Could such apparent or awkward "silence" be explained thus:
Judg 2:10 Moreover, in time death overtook all that generation; and there arose another generation after them, that did not know [recognise, understand] the LORD, nor yet the work which He had wrought for Israel.
Psa 78:42-43 They did not remember His power: the day when He redeemed them from the enemy. When He worked His signs in Egypt, and His wonders in the field of Zoan.
As it was for Israel post Egyptian bondage, so might it have been for new covenant Israel when they came out of Sin-Death bondage in AD70, within a generation some forgot the work that God had wrought for them.
Or, could it have been that "Christians" who in that time were predominately viewed as a sect within Judaism, and that due to the whole-scale destruction of practicing Judaism throughout Palestine in the Roman-Jewish wars, that the Church as it was in its infancy fell into a self protective and preservative silence.
Or perhaps one further thought might suffice – a simple explanation as to the apparent, and yet frightful to some "silence" post Parousia might simply be that of REALISED REDEMPTION – all was complete – there was nothing left to say. Whether it was realised or not, in the Cross-Parousia event humanity had been fully redeemed and reconciled back to God. Yet it has been man-meddling "religion" on the other hand following on somewhat later, that taking a while to gather up her feet has delivered to us what we know of her today.