There's really no reason to bother with very specific strategies up until monarch, and monarch isn't really all that bad either unless you're playing with the new AI patch
The big thing you should be looking at when moving past noble is fundamentals not necessarily specific "failable" strategies that your situation may make impossible and thus cause you to waste a lot of time and resources. Take a look at what you like to do most, and find some very basic strategies on these forums for making those routes better.
If you're a war lover, then as someone pointed out early war can be a great way to get a big empire and a few techs if you have alphabet. Find some copper or iron ASAP and start churning out a military then find someone to use it on
If you're a builder, check for ways to optimize your building/tile improvement/city specialization strategy here on the forums, slavery is a good solid civic for early building (and late for that matter), I wouldn't try to do fancy stuff like maximizing the overflow or what not, but just keep in mind that its a tool you have at your disposal and make use of it when you feel it will be useful, same with forest chops. Also take a look at which buildings you prioritize, if the city is already healthy an aqueduct may not be the best choice, just look at each building and say "do I need this yet?" If not, you may even think about building research, or more units to keep your empire safe from the likes of Monty, if you're not at your unit cap (or above) you are inviting danger.
If you're a diplomat, take a look at your tech trading strategies, play around with sicking war monger AIs on the tech leaders to slow them down so you can take the lead, or embroiling your enemies in useless wars with far off neighbors so they never come knocking on your own door. Read up on how to best make friends with the "right" civs, and always remember that invariably you'll have to choose a side or end up all alone on your own side.
I'm by no means an expert player, but I've gotten wins without using a specific trick or strategy just by having a good solid empire, and a victory in mind that I work towards.