Scoring is a mix of IMPs and point-a-board (board-a-match).
1♠ was in a strict 4-card major/strong NT style
2NT FG raise
3NT likely to be a weak NT type hand
You are a great player. Opponents and partner have also all played open international bridge for their country, but partner is not a regular partner.
You lead a systemic low club. Declarer considers matters in a normal trick 1 type of way and plays low. Partner wins the ace of clubs, declarer playing the 2. Partner switches to the 8 of hearts, declarer the king and you win the ace. Your style when switching is pretty standard.
What do you play next?

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3NT P 4♠ all pass