This question gets asked 5x a day on average.
To get things indexed you gotta catch the crawler's attention.
There are literally 1 million ways to do it.
I'll make one up right now and randomly post it, here goes:
Create a landing page and cloak it.
The cloaked version contains the links you want spidered. The safe version contains puppies.
Blast the landing page on social media and shit. Get the puppies liked.
When crawlers come in, you show them the links version.
You can change the links often and they'll get spidered every time.
See? Doesn't take much to create a neat indexer. I just made that one up this minute. You can be creative and come up with your own solutions.