Well first thing is to be realistic, why would anyone employ you to fly a drone? Most large companies will just buy their own drone and train one of their employees. I am not saying 3D mapping is not possible but their is a large investment in equipment and software and skills. I have looked into this myself.
Power line inspections would probably be done by the power company, I mean realistically why would they employ some guy with a
Mavic 2 Pro?
Real estate is a possibility but here in the UK most estate agents either pay very poor rates so as to make it not worth doing legally so they do it illegally.
Weddings could be possible especially if you do ground video as well.
Stock photography and video is definitely possible but its quite a saturated market so don't expect to make much money.
Things could be different of course in Lebanon and I am only looking from a UK perspective, I do it commercially but the paid work is mainly promo photos and video for their company that employees me for my main job.
I don't want to be too negative but you do need to be realistic too, drone work is unlikely to give you a full time living.
Good luck with whatever you decide to do.