The tree is probably in a biennial cycle and it should fruit again next year on its own. What you can do at that point is thin the fruit early so it's not overloaded and that should get it back on a yearly cycle.

You can prune it but that probably isn't what the problem is and depending on how you prune it you could hurt next year's production (like if you do the typical hack job of those who don't know about fruit trees and leave nothing there to fruit with).

You should at least dead wood it. Other than that it's impossible to say what it needs without seeing it. It could need some heading back. It could need thinned.

You can also quite safely thin a lot of living branches. Even if you remove over 50% of the wood the tree will be fine if you cut out whole branches. It is hacking back of branches that counteracts fruiting.

By opening up the tree to air and light you will improve the fruit quite a bit, but not as much as you will by thinning fruit very early, first limit the clusters to a single apple and than, if necessary, thin to one apple every 5-6" a couple weeks later.