First, I generally agree with the prior response. That said, here's my spin on your questions:
It's OK to demo residences, if you have overbuilt. The cost to you of having an unhappy populace is much higher than the cost of replacing any residences you demo. There is no penalty for doing the demo other than the populace of those buildings all move away. No worries though, they will come back when there is a place for them. There is no long-term downside to doing this.
When I was in a similar situation with the storage bars, I went ahead and sold ALL of the cameras and locks to free up storage. TRY to buy storage bars, if they are available to you, and only buy back the locks and cameras once you have enough storage bars for the next upgrade. NEVER EVER sell your storage bars until your storage capacity reaches 250 (the max).
USE the land expansion items, even if you don't need the land right now. You don't have to provide services to empty land, but those expansion items are harder to buy when you are at a higher level because of how the Global HQ currently works, and as you've noted, they take up precious space in the storage depot. If you decide to sell them, I suggest only selling to the marketplace at the maximum price it will allow you to sell them at. Someone will buy them and, in my opinion, I'd rather sell them to a player who needs them than back to the game. Resources that can be created by the player can be sold to players or the game, wherever you get the best price, but expansion items are controlled by the game, not players, so I won't let the game have them back except by using them for expansion. And yes, after you sell expansion items, the game will still give you more in the future.
If you logged in via Facebook, you would need a different Facebook account or the game will revert to the city already created and tied to that Facebook account. This is a Facebook problem and not a Sim City problem as I've seen people complain about this on other forums for other games as well.
Regarding sales of small items you've made in the game, if the game gives you a better price than the max price in Global HQ, then by all means sell to the game. There are, according to an official post elsewhere, about 8 million transactions per day in the Global HQ, so this means there is always a player looking for any and every item that can be sold. Until EA fixes the issues with Global HQ, sell your excess items at the maximum price the game will allow you to sell them at. If they don't sell within a couple of days, usually, "Daniel's City" will step in and buy them directly from your Trade Depot at the price you asked.
The most important thing, based on the level you are at, is to secure your town financially before you further expand residences. If happiness isn't above 95% (or probably 99%) then figure out why and correct that. If you have too many residences, demo some until everything fits within the footprint of your coverage area for police, fire, and medical. You do NOT have to cover them with education, transportation, etc. They will complain, sometimes, if these things are not available, but it doesn't affect their actual happiness, so those things can wait. Once your Sims' happiness is stabilized, work on your financial stability. Build stuff and sell it. Build the most time-consuming items you can build and sell them in the trade depot for the maximum price allowed. Advertise but don't spend SimCash for advertisements. Suggestion when making multiple listings is to advertise the last one first, that way people responding to your ad will see your other sales as well. After five minutes, advertise something that hasn't sold yet. I stopped growing my city when I was at about the same point you are at now. I built up my finances until I had a million simoleons, then started playing the game again. It made a huge difference.
Once you have financial stability, it's time to expand land and storage. The lower your level when you start this, the better your odds of finding what you are looking for. You need to buy (when you can afford it, but before you start expanding population again) the items needed to expand your land and your storage. As mentioned above, storage expansion items should be started with the storage bars first. Once acquired, buy the other related items. Due to their rarity, never pass up the chance to buy storage bars, but for the other expansion items, once you have enough of one item for the next expansion, get the other items for that expansion and complete it, before getting the rest. Use your judgement, however, if someone has 20 gears available, I wouldn't pass them up just because you only need nine more! There's no right or wrong order to expand land, just do what works for you.
There's no need to start over. 😕mileyhappy:
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