Was able to open after the move, but not necessary to always lock. Emptied safe and locked and took several attempts before being able to unlock. It is a long combination with several turns and four stops. Is there anything that I can do to make it easier to lock and unlock after all this time?
Yes. Next time you get it unlocked, LEAVE IT UNLOCKED! (Yes, I'm shouting.) Contact a local locksmith who is a member of SAVTA to service it. It's several orders of magnitude easier for the locksmith and cheaper for the customer to repair a malfunctioning safe when it's unlocked.
This link should help you find a reputable sefe technician.
Except "your local locksmith" as found on a web search is often a scammer who drills out Kwiksets, or maybe someone whose skills are limited to prying car doors open to push the button. Your mileage may vary considerably.
Indeed, your old-school brick-and-mortar locksmith who has been in business for more than a decade and has done at least a minimal amount of safe work can likely handle it, but the original poster is more than likely to run into someone not competent by using Google to find a "local locksmith".
And, your local old-school locksmith who has been in business for more than a decade and has done at least a minimal amount of safe work is likely to be a member of ALOA and probably SAVTA. You're not going to pay a substantial premium between a bonafide competent local locksmith familiar with safe work and one who cares enough about the trade to be a member of a professional association.
To put it another way, hiring a SAVTA member locksmith pretty much assures that the safe will be properly serviced and good for at least a couple more decades of trouble-free operation. Hiring a "local locksmith" from a web search is pretty much a crapshoot and you may wind up with an unservicable or destroyed safe.