1. Main building upgrades consumes less resources but more time so when you are about to go to sleep run Mainbuilding and also prefer Townhall upgrades.
2.Make any one cropland 5 faster and get a Grainmill and also make one cropland first and try to build a bakery. The point is whole croplands(level1-10+) will get boosted once you built a grainmill/bakery
3.One woodland to level 10 and get a Sawmill, One clay pit to level 10 and get a Brickyard, One ironmine to level 10 and get a Iron Foundry.
4.If you depend Crop to resource NPC in 15cropper capital village, all you should concentrate is on Cropoasis+Grainmill+Bakery. I suggest you to upgrade Markets in the the support 9/15 croppers you settled.
5.T4 Hero can boost some resources and you can choose which resources you wanna boost with a checkbox