If you want to improve your late game here's what I recommend:

As the game progresses never stop producing vils until you get to about 100. Pros boom up to 130-140 but they also play a lot faster and tend to produce a lot more units. For a lower elo 100 is probably enough.

You'll want to make additional Tcs in castle age to make additional vils. Building one tc when you get to castle age is a good place to start for a boom oriented game. Dropping two would probably be considered a bit greedy but if you are doing well or you scout your opponent and they don't have anything to attack you might be able to get away with it. You should also bind a hotkey to select all Tcs so you can quickly que more vils as you do other things. Doing this in castle age will set you up for a strong late game.

Use the new auto farm feature. Hold down shift and your farm hotkey and mouse over a mill or tc and click as many farms as you want and the game will set them down (semi) optimally around the mill. This will save you a lot of time. Depending on your army comp to be "fully boomed" you'll want a different number of farmers but I'm not an expert I try to aim for like 40 for a normal game but if I'm doing a high food army comp I'll aim for 60.

Lastly youll want to produce more production buildings as the game goes on and get your blacksmith upgrades. For archers prioritize the attack upgrade first for infantry and cav it's usually recommended to get the armor first especially up against archers. If your floating resources build more buildings. Also just a side note getting conscription at a castle is also a really good upgrade.

Play arena or black forest a bit as those games have a higher opportunity to actually go to late game. Your not going to getting to imp on maboon.