I am upgrading code from Sitecore 8.2 to Sitecore 9.3.

In Sitecore 8.2 we have a code snippet:-

public Contact GetCurrentContact()
    {
        if (Tracker.IsActive && Tracker.Current != null && Tracker.Current.Session != null)
        {
            return Tracker.Current.Session.Contact;
        }

        return null;
    }

    public Contact IdentifyContact(global::Sitecore.Security.Accounts.User user)
    {
        if (user == null)
            return null;

        string contactIdentifier = GetContactIdentifier(user);

        if (string.IsNullOrEmpty(contactIdentifier) || contactIdentifier.Contains("anonymous") || Tracker.Current == null || Tracker.Current.Session == null)
        {
            return null;
        }

        Tracker.Current.Contact.Identifiers.AuthenticationLevel = AuthenticationLevel.PasswordValidated;
        Tracker.Current.Session.Identify(contactIdentifier);

        return Tracker.Current.Contact;
    }

In this Sitecore 8.2 Contact object is coming from Sitecore.Analystics.Tracking but in Sitecore 9.3 do you need to convert Contact to Sitecore.XConnect.Contact?

I have another class to send and receive this Contact to/from Xdb in Sitecore 8.2

 public void SaveContact(Contact contact)
    {
        // Save the contact and release the lock.
        if (contact == null)
            return;

        var options = new ContactSaveOptions(release: true, owner: _leaseOwner);
        _contactRepository.SaveContact(contact, options);
    }

This is Sample code of that class. In this class also I am getting parameter contact in form on SItecore.Tracking.Analytics.Contact. How can I convert this contact to XConnect.Contact for Sitecore 9.3?