Your problem with Olympia is that it requires a clear plan and an execution without any deviations, but your style of play is loose - this works well with flexible wonders such as Ephesos or Hali and sometimes with Babylon, but you will struggle mightily not only with Olympia, but also with Alex and Gizah. For example, this game: https://boardgamearena.com/gamereview?table=227296476
. The setup is very favorable to you. Even before the game starts, just by looking at your neighbors you know that Hali and Alex are in green and Baby is in red. Thus, your plan here should be to build a lot of browns, so green Hali and Alex buy them from you, dominate the military, while Alex and Hali fight for green, and play blues if an opportunity comes up, but instead what do you do?
Hand 1 - Not taking Excavation is a critical mistake. Excavation helps you with the second stage, Alex and Hali both need bricks for their first stages and are very likely to pay not only for it, but also for stone in Age 3 as well, as they are not likely to play a lot of it and it is needed in large quantities. Your Excavation also stretches Baby across the board, as these are exact resources Baby needs. It allows you to play baths, it prepares you well for the most important guilds in your position, such as the Philosopher's etc. Remember that there are two guard towers in 4p and your green neighbors are not likely to play them.
Hand 3 - Here ideally you should have taken Guard Tower after playing Excavation hand 1, but even the way you played you should have taken Lumber Yard - wood is a cornerstone of any red game, which you should be playing in this position.
Hand 5 - Again not taking Lumber Yard is a mistake. Even a clay pool would be better here than your trading post towards Hali.
Hand 6 - Ideally, here you would play baths for free after taking Excavation hand 1, but, if you pay, you pay for Barracks to ensure your military lead in case of an unfavorable card order Age 2.
Hand 1 - Aqueduct is a ginormous misplay here. Ideally, you play Foundry to help with your first stage+ore is also critical for the red game you should be playing. Stables are also ok here, but your resources are weak and there is no military emergency, as your neighbors are in green. Blues are simply not enough in 7 Wonders, unless you are really really good with them (for example, there is only one top player, who is strong in the blue game - Masca).
Hand 2 - Hiding School is simply unacceptable here - 3 players are competing for greens in a 4 player game - this is the most favorable setup for you - you do not need to hide any greens, as your opponents will just drain each other. In fact, hiding greens encourages Alexandria to play military which you do not want at all costs, as your goal is to dominate the military. Instead, a heavily green Alexandria is the best thing which could happen to you now, as it will pass you juicy cards Age 3, but at the same time will be prevented from hitting a green jackpot by Baby and Hali. Ideally, you would play Training Ground here after playing Foundry from the previous hand, but even the way you played Forum or Bazaar are much better to build a yellow economy.
I stopped watching after that, as 6 out of 8 hands were misplayed, and it is a gg at this point, but most likely what happens is that, because you do not play military resources and pass military cards, you get red-sandwiched. If you will think carefully about your plan going into the game, your results with Olympia will improve tremendously.