I have wasted a lot of time on this topic.
Drones are a crap shoot, the higher you get the more the weight of the fishing line drag and cross wind will mess with you. Flying through the branches then, more importantly, flying DOWN is impossible without the fishing line getting caught in the rotors. If you use a drone consider it a consumable.
Ive tried aggressive sling shots but its a ratio of the weight of what youre shooting relative to the drag of fishing line. Use too much weight then it won't fly high. Use too little and then you dont have enough to pull your line down the other side of the branch back down to earth.
Ive considered using a crossbow but lost interest.