I'm doing OK with my first proper Quecha rush strategy, top of the score table, 1000BC, 4 civs dead already, but my economy has crashed even though I only kept capitals (and 1 nice barb city).
You're Financial. Research Fishing as your first tech, then Mining, The Wheel, Pottery, and BW. With Fishing you can work 3C water tiles, especially in the coastal cities. Some of them may have fishing boats already built by AI for you, good to build Workers and Settlers.
Settlers you need if you have some Gold/Gems nearby. Build a city next to Gold, build the mine, and start working it immediately (the city won't grow, but will generate commerce.) This will help you to stay afloat until you build enough cottages and research CoL (via Polytheism -> Priesthood), which is your next priority. You can grab Alphabet or CoL with Oracle.
The next thing after CoL is Math and Currency, so you can build wealth in some of your cities. Then whatever else, Literature for GL, Construction for cats, CS for Bureaucracy, etc.
6 turns to build a road? 12 turns to build a cottage? 12 turns to build a mine? They have got to be having a laugh.
The good news is that the same is applicable to the AIs as well. They'll be extremely slow in development. After you built some cottages, you can start building Axes, and crush another rival civ or two. Then throw in cats, then Macemen, etc. This time you can keep most of the cities, and start milking the score.