So while drones are indeed highly effective, and arguably the future of warfare, it should be noted that their operational effectiveness is currently being distorted somewhat right now due to the fact that they are mostly being utilised in combat against an enemy who not only has no drone defence but has actively taken steps to inadvertently make themselves much more susceptible to drone attack than other modern militaries.
Ukraine is also struggling somewhat against Russian drones - there was a good article about it on the BBC recently actually https://www.bbc.co.uk/news/world-europe-67991772
Most militaries are poorly prepared for them, while the medium size stuff can be dealt with by the likes of the Shilka and Gepard and the larger stuff by a variety of air-defence platforms and there are some ewar systems out there for jamming, etc. there are few optimal systems for dealing with a range of drone threats. Which is surprising really as the basic physical mechanics of such a system aren't overly complicated, detection and the algorithms involved a bit more so but not an exceptionally hard problem to solve.