Maybe you should just respect their privacy? If someone has a private Instagram profile, they’ve made a conscious decision to limit who can see their content. Trying to bypass that—whether through tools, tricks, or any kind of workaround—is not only against Instagram’s terms of service, but it’s also a violation of trust and personal boundaries.
If you really want to see their content, the honest and respectful route would be to send them a follow request. If they accept, great—you get access within the boundaries they set. If not, that’s their right. There’s no moral shortcut around respecting others’ privacy.