I am confused by your goal.
Tips I was told:
Upgrade your Watchtower along with your Stronghold, it produces a lot of iron & food.
Finish as much of season 1 as you can to boost your Watchtower.
Upgrade one training camp along with your Stronghold so you don’t end up with a Stronghold 20 and all camps at 11.
Stronghold 20 unlocks a camp, recruits storage, food storage, and a farm. Buying a one month VIP Pass for this part can help manage builders.
When low on iron, upgrade your mines.
Don’t over build your recruit storage and food storage since you get another of each.
See also
[Analysis, Math] Minimum buildings for Training Camp 20