Try to break them down into small steps on a tramp.
For Corks for example start off by doing unnaty 3's to your back. Once you got them just look behind you and reach for safety once you reach 3 and are on your back. Hold it till you spot the ground at probably 5-630.
For Spins where you need some kind of body tension like flat 5's, cork 3's etc you'll really have to focus on holding the grab tight and keeping your body tension. Break it down into small steps again but be sure too reach for your grab as soon as possible and just hold your grab really tight. Try too push your leg against your hand when holding the grab and you should be fine.
For cork 3's / 5's I can only recommend getting an wide stance right from the beginning and trying too look at one spot infront of you since they tend too tourn out as flat 5's.
for rails, find a small flat bar or even box and just slide it as much as possible. Progressively start doing front twos and blind twos. this will help with front swaps, back swaps, etc. you may eat it a few times but theres no way around that one
Rain is like that one annoying cousin everyone has
I should probably quote somebody here
follow me on the gram @ethan_bernhard i follow back ;)
Im in the unnatty stage as well. Im hitting my setup unnatty as much as possible. It all starts with a solid pop/get on the rail, after its all balance and edge control. If you can front swap to switch you should have a little bit of experience sliding unnatty already which helps. I have a box that i just set up on the ground and practice using my edges for spins and control. If you have a smooth pop/entry on the rail, just mess around on a box to get used to using your unnatural front ski scissoring