Aw kudos to you for getting the glider into a much more comfortable living situation.
Older gliders do usually take more time to tame, especially if they haven't had much human interaction when they where younger - but it's not imposable!
I wouldn't force any interactions. Don't try to grab him to pick him up - let him come to you. You can try putting some licky treats on your hand for him - something like fruit baby food or apple sauce. Licking small amounts of that type of stuff off your hand will help him to associate you with pleasant things. You can also give him treats - most gliders will go crazy over meal worms.
Do you have a bonding pouch? During the day when you're hanging out around the house, you can put him in a bonding pouch and carry it near your body. If he'll let you, once in awhile you can reach in and gently pet him. A bonding pouch is similar to the types of pouches you'd use inside the cage, except for that they zipper shut so the glider can't escape.
You can also get a piece of extra fleece and rub it against your skin or wear it against your body for a few hours, then put it inside the cage with the glider. It will help him get use to your smell.
Tent time is a fun way to bond with them as well - pretty much you just get a small one or two person pop up tent, and fill it with fun toys and things to explore. Bring your glider into the tent and let him play and explore, and just sit in there with him. He'll probably eventually use you as a jungle gym haha. Don't try to pick him up at first, but as he gets more and more use to you he should become less afraid of you.
Remember that gliders are so small, and he's in a completely new environment where a giant creature (you!) keeps sticking it's hand in his environment...it will take him some time to learn that you're not going to hurt him.
Are you planning on getting him a buddy? Gliders are highly social and almost always do best in at least pairs. Also, on more than one occasion, I've seen adding a second glider help the first glider become more friendly. They are more comfortable with a buddy and if the second glider is friendly, they can help teach the less friendly glider to learn to trust humans.
Good luck with your little guy! Did you give him a name yet?
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