A drone carrying drones.
Was suggested quite some time ago and I remember thinking it was a silly idea because it is a bit redundant... but actually long range communications with drones and control systems are expensive, while FPV drones are relatively cheap.
If you separate the expensive from the cheap and use each where it makes sense... expensive allows long range and quality cameras and equipment, while cheap and simple is good for suicide drones that are only used once but they lack range.
By having a larger drone that is long range and has good cameras and navigation equipment and put small drones with short range, cheap motors, cheap relatively small batteries that can't be recharged thousands of times... maybe only tens of times or even just once like a hydrogen battery that can be stored indefinitely with onboard "fuel" that does not need charging before use and will work once just fine every time... then you have a good combination for a recon/attack drone and a suicide drone that it could carry.
The carrier drone has good range and speed and good cameras including night vision cameras of decent quality so targets can be found and identified, and can loiter for long periods and then return and be reequipped with more suicide drones.
The suicide drones can be super simple and super cheap... you could even have some with HEAT warheads and some with HE frag warheads depending on the target... soft skin or armoured. You could even use incendiary for attacking building with enemy forces in.. a bit of thermite on the roof will quickly burn through and set fire to lower levels in even the tallest building.
The suicide portion of the drone can use cheap electric motors and cheap batteries... perhaps one use chemical batteries, and a variety of different warheads, and cheap simple datalinks going through the carrier drones comms to operate deep behind enemy lines with a data range of 4 to 5km, which is to reach the carrier drone which might be 200km behind enemy lines at 5km altitude where no one can see or hear it... The suicide drone will be mostly falling... a few guided bombs could be used for easily visible targets and drones to chase down more elusive targets...
The Russians and Soviets have been doing it for years with SAMs... make the missiles cheap and simple because they are the expendable portion of the system. Make the launcher sophisticated and capable of detecting and attacking all sorts of targets, and then the missiles will be cheap enough to produce in eye watering numbers.
Make the recon drones sophisticated enough and expensive enough to find targets and suicide drones and smart munitions cheap enough to buy in enormous numbers.
The expensive recon drones get used over and over and the money spent makes them very effective, while the suicide drones are cheap and effective enough to get the job done well...