Since my winrate on Deity Isolation isn't that great, I went for the GLH. With learning in mind, I probably shouldn't have done that. Since it helped cover the wrong decisions I made in this game and made sure I still have a shot at winning later. But I have no illusions, many mistakes were made here.
I teched: Mining -> BW -> Sailing -> Masonry -> The Wheel -> Pottery -> Writing. Turned off research and collected 300 gold while getting up two libraries. 4th city came quite late since barbs caused me some trouble so I am not even taking full advantage of the GLH at the moment. But I settled it next turn.
I continued with Mysticism -> Polytheism -> Priesthood -> Monarchy to solve my (un)happiness issues and grow the capital to a worthy size. Note that I have more settlers ready, but barbs are storming the little chokepoint I created. Soon I expanded to 6 cities. Generally my city placement has been highly questionable for the most part.
After Monarchy I somehow decided to tech Code of Laws to help with GPP production, but with better planning this wouldn't have been needed at all. So a genuinely bad decision. At 1 AD I also have Mathematics and Iron Working. I was quite late to settle the jumbo area. I still need Metal Casting, Compass and Machinery to free up the necessary bulbs.
Being so worried about generating the necessary GS for the Astro bulb, I didn't build an academy and just hoarded the GS I got. I got three of them from three different cities.
I bulbed Optics at 500 AD (since Machinery only came in 475 AD) and still had to wait a few turns for GS #3 to finish Astronomy in 640 AD. Only met 2 AI so far, Civil Service just came in. But due to the lack of academy and atrocious city developments my beaker rate is a joke. Even more so when you consider that I have the GLH here. The reason for this is simple:
I only have 2 cottages, 1 hamlet, 1 village and 1 town in my whole empire. Rusten has 15 villages alone and already a better tech rate even without Civil Service. So with GLH it's not inconceivable that he might just have twice the beaker output I do at this stage. My thinking was to work fin-coast for the most part and take someone out before cottages matter. But the timing was all wrong and I would have benefited a lot by building for the future (build academy, work cottages). Settling the rich jungle-land as late as I did also was a bad decision all around, especially with GLH. My cities are also smaller and worse developed, which has partially to do with bad placements aswell. At least I can see very clearly what went wrong and realizing that is the first step to improvement.
So it's all a bit depressing to be honest. But even playing as badly as I did, the game is not lost (even though it almost feels that way). Many years later I managed to reach a respectable position with a shot at winning the game. Even though with a different leader and/or without the GLH it might have been gg with all the mistakes already committed. So I can promise some serious fight here and will try to win despite all this. Domination or UN, nothing too cheesy.
Looking at the much superior play from Rusten here, it's hard for me to fathom how I won 26 Deity games in a row a few months ago (even though only 2 of them were isolated ones). But it also fills me with hope and ambition, as I can see just how much I can still improve and certainly, I could one day win even more games in a row by doing so

. Just to finish on a bright note here while I rather feel like deinstalling the game and playing Tetris instead

.
But well, it's supposed to be educational and some personal embarrassments are a small price to pay for that I suppose. Even still, feels bad man.