I forgot to put a no index in ony of my sub domains, and for some reason it has been indexed by google in just a few days... which is weird because there are no incoming links to that sub domain
Moral: If links are healthy they will index fast. Post some of them in SM, twitter and facebook. Also you can create a domain just for indexing purposes. Use the video indexing technique, still works. Also you can create a redirect in one of your domains and ask for the index through GSC.
This are manual indexing procedures if you have just a couple of links. If you need to index like 50+, then purchase an indexing service in the marketplace.