Javelin missiles are just one thing, but cheap drones with simple rockets on them should be able to take out a moving force of numerous tanks.
Imagine having an arsenal of 20 tanks storming your city.
Now imagine having about 100 drones ordered from Amazon, outfitted with RKG-3 anti-tank grenades. One each. You can fly low, you can fly through the woods, and you can fly each individually operated drone right up to the top part of a tank, and boom.
No clever software automation. Just a drone that can lift something like 1 kg worth of anti-tank grenade.
You have 20 drone operators. You'll have 5 drones per tank. One after the other. Skip the already defeated tanks. Attack the tanks that will create a barrier when destroyed first, take natural barriers into account.
Your tanks can have all the power and shock and awe you might think they have, but any 12-year old will be able to take you out as if they were playing a video game.