On Dad's birthday, you can prepare a table of good food and wine for him, buy a cake, have a good chat with your family, and send your blessings to him.
If you really want to choose a gift, you can buy a footbath for Dad. This is very popular now, the kind with constant temperature and massage function. Let Dad soak his feet and massage at home every night, which can relieve a day's fatigue and is also good for health.
By the way, men usually have several belts to use in turn, otherwise the belts are easy to wear out and break. You can buy a belt for Dad to express your feelings.
Some time ago, I bought a razor for Dad, and Dad liked it very much. You might as well try it. Men can't live without razors. Buy a better razor for Dad, and Dad will definitely be happy. I hope I can help you.