This is a really BIG area for discussion. Enrichment is all about improving and enhancing the quality of life for your parrot. Imagine moving from an expansive estate into a small one room apartment. Well that's kind of what we have done to parrots.
Let me explain ...
In their natural environment parrots have free range of woodlands, rainforests, palm forests, savannas, grasslands, desert edges, or scrublands. They enjoy the company of a large flock of their own kind where they experience all the joys, excitement and rewards of social interaction.
When removed from their natural environment, they are put in 'isolation' much like humans are experiencing right now with the COVID-19 virus shelter-in-place orders. I think now more than ever we can identify, but imagine how it feels ... not only to be a social creature who is isolated, but also to (likely) not have your own kind with whom you can interact!
Consider your parrot's existence from this perspective and re-evaluate the environment that they live in day after day. Try to make improvements to give them a higher quality of life. This section is here to provide you with some ideas on how you can make your parrot's life more rewarding... you can't do all of them but do as much as you can.
Outside in the Aviary
Inside Community Trees
Enrichment, to me, is one of the fun parts of parrot ownership because you get to use your creativity to transform a 'captive' environment into an enriching life. Here are some links for adding creative items to your bird's life.
As always, not everything is safe for your bird so do your research!