While you could dive in at the deep end and purchase a drone, they’re more expensive than a house. Some are more expensive than a full road of houses! (my new currency is houses, does anyone have change for one?)
Back to the point. Sounds like you have a cool hobby. Freely climbing in a range of local mountains and valleys! Awesome!
If this project is to be a hobby rather than just a tool, then perhaps starting small and working up would be a good way to progress.
For filming in caves I’ve purchased a small helicopter with a camera. It was not expensive and can’t deal with wind at all. Fine for caves though. Image quality is at the fun end of the spectrum rather than good
Rather like a drone, I’m not flying it while viewing the footage. I have to download it after. It has completely changed my direction from wanting a drone to wanting immediate feedback of the footage. Perhaps later, if I get really enthusiastic (kids are on the way so this won’t happen) drone like modes would be good. There’s no way to control anything once it’s gone round a couple of corners in a cave as the rock eats radio waves you see.
In conclusion I present 2 directions for you. Firstly a hobby, progressing and building up to whatever it is that you really want, testing the water along the way. Or secondly, to become an evil mastermind, live inside one of your local mountains with lots of minions to do you bidding and use a giant parabolic space mirror to see around your local area.