Hi @Ajeetkmr154
You will need to using something like uSync Migrations to migrate Nested Content to block list. Likewise, if you have any Grid Layout this will need to be migrated to Block Grid and any RTE macros will need to be converted to RTE blocks. You will also need to update any obsolete data types in the backoffice and switch to newer supported versions. Once you have done this, your upgrade path to v17 should be smoother. You may still have custom backoffice code that needs converting from Angular to Web Components but you can do that once you are on v17.
As @luuk said, you can go directly from v13 to v17, you should not need to go through the intermediate STS versions.
I hope that helps.
Justin