Omni would be my first all around choice because it’s so loaded with endless options and yet you can always add tons of amazing libraries by third parties that fit your bill such as plug in guru ( mega magic pads are amazeballs as are many others ) Joseph Hollo and luftrum .(nevertheless create your own sounds)
Speaking of luftrum. Lunaris ( a Kontakt library by him ) is perfect for what your doing though it can be a bit cpu heavy .
Almost any library from the talented Eduardo Tarilonte ( forest kingdom , epic world etc ) .
Ambient white by big fish audio ..zodiac by them could also be useful.
Impact sound works Celestia.
Check out the three by audiofier. They are great and so much bang for the buck ( often on sale ) Abstrung , Vesper and Aerkord.
Ethereal by subsonic artz is also Inexpensive
There’s alot more including most synths such as spire , serum , zebra 2 , avenger , falcon , and the list goes on ...