If it’s just a single bird, you won’t ever be able to give him a normal or happy relationship at all.
Sorry, I’m a person who will always give the advice to get your bird a friend.
Budgies are highly social. They need a partner.
And that partner can’t be you. :/
Think about the birds needs. Don’t make it be unhappy because YOU want a tame bird. Talking budgies are maladjusted. Don’t force it to become tame.
People with just one budgie will never find out, how wonderful it is to see them playing in pairs or a small flock. To me, seeing them interact with each other is just the best thing ever.
I can’t give any advices to tame a budgie. Mine come to sit on the hand for treats, this took over one year for them to built up trust. But after all, they’re not tame at all and just doing their birb business.