Great move by Turkey. First of all, tactically it is gorgeous- every unit had a purpose and every unit is in a position to be successful next year. It also is very strong tactically. France's stab on Germany was coming, if not this year then next year (or last year), and it was important that Germany could put up a good defense. if Russia and Germany were just bashing their head against each other, France could divide an conquer and likely take the top 17 centers + Tunis for a solo. Now, Germany can put up a credible defense and a French solo seems fairly unlikely.
In general, there were a lot of good ideas with everyone else's moves, but they left a lot to be desired (perhaps with the exception of Germany). To be clear, though, this advice applies to all powers.
Austria, you should be ending this turn with 4 centers. Never hold when there is a move that isn't a hold that is strictly better. You had to know that Budapest was going to be hit in some way by Russia, as Russia needed fuel for his Germany fire. In fact, I was expecting him to support himself into Budapest. But even if him supporting himself into Budapest was your guess, it is still better to move there, in the off chance he doesn't, as was the case here. Moving to Budapest was guaranteed to be equivalent to a hold in Vienna at worst and would have ended up with Austria having 4 centers. Holding was a really bad move.
Italy- in general, I like that you were aggressive- small powers need to be more aggressive, not less. However, in this case your aggression was unwarranted. France had 4 fleets in the area, most of which essentially had nothing to do. You weren't going to push back France with your two fleets. You should have either just support held and then either shifted to Apulia with your fleet and invited Turkey into Ionian Sea (after a Turkish fleet build this establishes a stalemate line) or gotten Austria to stop ordering a bunch of holds and start cutting potential French supports, giving you some wiggle room.
Russia, obviously it's not great that you were stabbed, and there were some strategic signs that it was going to happen (as I mentioned above), but everyone gets surprised by a stab every once and a while, so just reflect and think about how you could have known it was coming, and you will be better next time. However, it's worth mentioning that you made a mistake that didn't end up costing you but should have. Never support a move if you don't care whether or not that move succeeds. You didn't care whether or not your move to Warsaw succeeded- you just wanted to make sure Germany couldn't waltz in there. In fact, you would have preferred to be in Silesia OR Livonia (think about why). So not only did you waste Silesia's move, but you got a sub-optimal result, with the army now in Warsaw instead of Livonia. It would have been better to support yourself into Budapest or move to Silesia.
Germany, I actually think you played this year really well overall. I have to assume you had a hand in convincing France to build two fleets, and then you likely orchestrated France convoying you into Norway, which was a good way to force France to help you get another center this year even if he wanted to stab you. The only move I don't like all year is your move this fall with Bohemia. It served no purpose except to help everyone who isn't you. Even if you slipped into Vienna, you wouldn't be able to hold it long term and would essentially just be easing Russia's takeover of Austria. A better move would have been Bohemia to Galicia (although it wouldn't have made a difference here, it could have with strong Austrian and Russian moves), or, even better, an arranged bounce in Munich. The French move to Burgundy paired with his strange retreat to Tyrolia should have set off some alarm bells that a stab was possible, and simply setting up that bounce probably would have been enough to dissuade it.
Finally, France. I was *sure* that you were going to stab after that retreat to Tyrolia, as I thought that was the only possible reason retreating there was justified. And you did stab, but you didn't actually use Tyrolia! Tyrolia to Munich, Burgundy to Ruhr would have been a much, much stronger stab. The way you did it here, you likely only have one build coming next year and a rocky path forward after that. You could have broken Germany's back. Now, with your weak stab, it seems almost impossible for you to get Berlin, so your 18 likely has to include at least 2 centers in the south (like Rome and Tunis) which means you won't be able to fall back to the easy stalemate around Tunis only. You have a tough path to the solo, but it is still possible. You need to leverage the powers who will be eliminated if the game ends in a draw.