Other well wishers of the site like you who have communication line open with veterans better use their good offices to bring as many of them back as possible !
Simultaneously it is appealed to existing active members to start contributing more constructive views through posts on the forum to make the mission of increasing activities on the site successful.
Rajpalji, don't remain in as assumption that we don't do our bit to invite them personally.
If a personal message (not automated) goes directly from you/owners, with the fact/assurance that their grievances will be attended (or looked into). Things can begin to fall in place.