Although Biden has yet to formally lift all sanctions, all the steam has gone out of the former Trump approach, and Iran has much more room to manoeuvre. It supplies the rockets, money and geo-strategic direction to Hamas.
Meanwhile, the Gulf and North African nations that made peace with Israel, or were considering doing so, see a much less reliable ally against Iran in the new Biden administration. Trump would comprehensively underwrite their peace agreements with Israel. Biden is much less enthusiastic about that.