There are several factors that depend on crawling. Below are the points that you need to check on webmaster
1. Check if sitemap syntax is proper
2. Check if html code is proper or not
3. Check is website and page does not have no index tag
4. Ensure you have allowed sitemap on robots.txt
5. Ensure that content quality is good.
6. Ensure you interlinking is proper
7. Ensure you add regular content daily to improve daily update in sitemap and hence crawl.
These are few factors that need to be in place. Sometimes it might take around 45 days.