There could be several reasons for this @Adarsh_Sahu, but you can do the following:
Increase the social signals for the backlinks. Suppose if you have written a guest article on Example.com, then increase the social signals for that guest article.
Use 3rd party indexing services for this. Most of them will be premium.
The backlinks you see in Google Search Console might be different from the backlinks you see on tools like Ahrefs, Moz, etc. This is what Google says: