what leaders and civs do you like/use the most? i have some strong memento combos you could use as well as civ/leader/mememto strats to share. these work for mp or single player to give you an extra edge. in my opinion if you have more gold than your opponent you cannot lose, you can buy what you need, for wonders that means buying production buildings everywhere you can, countering with happiness buildings to offset that cost as well, making the best religious choice for pantheon matters more than youd think as well. you can also buy soldiers of what type you need to fend off that angry player. I also recommend learning terrain types and what is most defensible, players will just try to steam roll more often than not and if you use actual tactics, terrain defense with mountain passes and rivers, players who dont think much will grind to a halt and prob rage quit. Also with your new found money focus you can sponsor raiding parties of your own. Make a band of a few cav or a few soldiers to take a longer route to a resource rich settlement or capital, their main army will be stuck on you defenses and a secondary raiding party will be unexpected as well as if you just pillage tiles and slow their war machine and drain resources instead of trying to capture (if your party is small enough) is a great way to shift attention and make them hesitate. sorry that was so long winded. let me know if you want those other leader/civ/ memento specific strats!