NOOOO please don't build more farms unless you are a food hyper which is best suited for bank, alt or support player.
If you intend to war and build armies, you can never outrun army up keep. Food will always be a blinking red zero until you open packs; or receive food from another player.
Red blinking 0 is normal and not really a problem, even with t4. Build a separate account as food hyper and make your main into a single rss hyper (wood, stone, or ore). Your food alt can also be a gold hyper.