The density of hairs on your head and the thickness of those individual hairs will affect how many locks you can get at a certain thickness.
It’s common for baby locks to have some exposed scalp. but as new hairs grow in between the sections and the locks thicken, your hair will appear much fuller. Try to do as little maintenance as possible (or no maintenance at all!), and your exposed scalp will definitely be less obvious … or it may go away entirely!
But for those with mature locks, the only solution for ridding exposed scalp is to restart with smaller locks, and even then, it can still be a challenge.
It’s up to you to decide whether you like your locks, or if your self-consciousness about your scalp outweighs your desire to keep the set of locks you have now.
Exposed scalp is mainly an aesthetic thing. There is no adverse hair health consequence stemming from having exposed scalp, so it really is up to you to decide what to do!
Sorry my advice sounds vague. I wish there was more I could do to help!