The problem with Iran lies in two places.
The first is that by 19th Century Iranian power and influence is contracting and that power is shifting towards Russia and the British Empire. This is why the great game came about, both countries wanted to turn Iran into a colony but they did not want to because they wanted all benefits and none of the disadvantages of that colony. So they both fiddled it through influence for Iran to sell it self out by westernizing, which they wanted and knew via technology from first world countries in the first place. (Double edged sword) However, once the Iranians sold their country to meddling powers they could never get it back when they actually westernized and were held to ransom by the great powers. (Now you know why they hate so us much.)
The second problem is Mohammad Shah Qajar, in that I don't know what is childhood was like, which is where men are truly created. In the mind. Depending on his upbringing, you can fiddle it to bring about a different outcome.
Naturally, however, there is an irreversible third problem to solve and that is the geopolitics of Iran as a Country. If you look at a map she has countries around her from all sides apart from the Persian Gulf but the Arabian Penninsula encroaches her entry to the open sea. Two
minimal strategic war goals to break part of this problem would be to own the Caucasus Mountains as a natural border between it and Russia in which armies cannot pass and to get access to the Black Sea. The second would be to colonize and keep the present state of Djibouti as an outpost to the world.
An expansion of these minimal requirements and to buffer Iran and its enemies, she should seek out other barriers. The annexation of the Turkmenistan area and the whole of Iraq (which would include Kuwait) provide desserts to her west (southern-western and western Iraq) and North-eastern flank which would greatly hinder any invasion. As a result, what is now Kuwait city (and Bahrain) would greatly strengthen the Iranians hand in the Arabian Gulf.
Your inclusion of Balochistan province is good because it is rough and harsh terrain and again acts a buffer between Iran and British India. Plus the ports relieve the strain on the Persian Gulf as the ports are at the entrance.
The only problem is Afghanistan. Afghanistan is the "Graveyard of empires" in that the British invaded three times (1839, 78 and 1919), the soviets in 1979, Americans in 2001 and here we have Mohammad Shah Qajar failing to take Merat province. Whereas Afghanistan should be part of Greater Iran I think it will be the pinnacle and last stage of the puzzle because of the type of and harsh warfare that needs be conducted to win. (if that's possible)
This is what Iranians currently think is Greater Iran. Much of what I said but I made adjustments of Strategic warfare and economic reasons.
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The really big question is when are they going to get conquer these lands. If Iran by 1914 was a great power and Ottomans side with the allies, you would think she would obviously side the Triple Alliance and if she successfully conquers these lands and Triple Alliance wins or loses. (Make a separate peace with ottomans and takes part in the treaty of Brest-Litovsk) Shed gain Iraq, (including Kuwait) the Caucasus Mountains and Turkmenistan whilst she already has the Balochistan province.
Now that I have outlined what the Iranian goals should be up until 1920, this must be set in motion by Abbas Mirza (who died) or Mohammad Shah Qajar who succeed him to the throne. First, however, I am going outline what Iran will face in the inter war years, WWII and the cold war.