I assume the reason of why trade volume ( non oil and gas sector) is not growing is due to your government self sufficiency policy where it can be seen in how Iran even impose import tariff of Indonesian goods at 150 % rate. If you impose high tariff, then of course other country will made reciprocal policy by imposing high tariff for your goods.
If we learn international trade economics, it is clear that high tariff is not good for our country development, more over the impact will be much greater in the environment where majority of the world economies apply to WTO regulation ( maximum import tariff is 20 % ) and many has made FTA between countries and their own region.
Here check on the tariff section, but I am agree that if there is no sanction then Iran economy will be much better, but it is your government own fault with the pursuit of nuclear weapon technology. The sanction is imposed by all Security Council member at that time, only Indonesia who was abstain, even your friend Russia and China supported it
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Dewan Keamanan PBB setuju untuk memperketat sanksi PBB atas Iran terkait program nuklirnya. Semua negara anggota DK PBB mendukung sanksi, hanya Indonesia yang asbtain.
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Check the tariff section
Find the latest trade data and tariffs between Indonesia and Iran.
oec.world
Well, personally I do support Iran's policy of self-sufficiency because without it, the industrial, agricultural and technological development witnessed over the past four decades could not have taken place, and Iran would most likely have remained a mono-sectorial producer and exporter of crude oil for the most part - which is actually what the exiled opposition (such as Reza Pahlavi, son of the ousted shah and others) as well as liberal factions inside Iran envisage for the country.
They don't like the idea of economic independence and are comfortable with importing everything from abroad in exchange for oil money. However this would be a strategic mistake since self-sufficiency is not just an economic but also a matter of national security; you never know if and when the Americans are going to sanction you and/or if your suppliers for whatever reason fail to deliver. Also, reduced domestic production impedes general scientific, social and human development.
So I don't think that a lifting of the sanctions would be so much beneficial to Iran's economy. Most of the economic problems Iran is facing are rather linked to the issue of corruption as well as to the adoption of neo-liberal (neo-classical) economic models by certain past administrations, which simply don't work and especially in Iran.
As for the nuclear file, this is essentially used as a pretext to sanction Iran. After all Iran has never violated the NPT and didn't attempt to manufacture nuclear weapons. Iran is fully within her internationally guaranteed rights, including with the uranium enrichment. A country like south Korea was caught enriching uranium to 90% without declaring it to the IAEA but was never sanctioned for it, and the event didn't even make headlines. Had this been Iran, the west would have blown the propaganda horns all day long.
It's out of the question for Iran to bow to unjust and illegal demands. Once you concede on something, they'll be back in no time asking for more and more until they've deprived you of your sovereignty or worse, your territorial integrity, your peace etc. Thus is the nature of zio-American imperialism.
And if Iran completely dismantled her nuclear facilities and forewent any related activities on her soil, they would invoke some other excuse (human rights, regional policy etc) to place sanctions on Iran. Actually it was only few days after the victory of the 1979 Islamic Revolution that Washington sanctioned Iran for the first time. Although of course, I very much appreciate Indonesia's vote against the UN sanctions in 2008.
Thing is that the conflict between Iran and the US runs much deeper than the sole nuclear quarrel. Because Iran is standing up systematically and methodically to US imperialism and zionism. Also, the hegemonist zionist regime has no tolerance for large resourceful nation-states with huge potential in its vicinity and aims to dismantle and destroy them, so even if Iran abandoned her principled policy of Resistance, the existential threat she is facing from the zionists and their western allies would not be lifted. In short, there's no other option for Iran but to counter and fight off their mischief.