How can I keep track of my Cloud Resource use?
A judicious usage of one of the cloud "orchestration" tools, such as Terraform or possibly Fugue seems to be the best way.

You can start small, pick a less important and not very extensive environment, carefully decipher it into automatable code and proceed from there.

Broadly this is referred to as infrastructure-as-code, for googling and other buzzword-oriented media applications.

More specifically, say, if you had your environment described in Terraform's HCL files, you would have required ID's exported as "outputs" and could operate on those from scripts/Jenkins jobs/etc