10 aged igs 300k followers

I've got 10+ 7 Yr old ig accounts
130k
51k
50k
13k
A few 10 and 9 k accounts
So about 300k followers in total
Some of random chick's others iphone or modeling or photography. Most haven't seen a post in a few years the 130k I use regularly.

Ideas on how to use these to bank?

You can test with shoot outs.

Make a pretend product or service you would shout out.
Monitor the traffic you bring in.
Use this as proof and selling material to others that your accounts are able to bring traffic to a product or service.