Being in the moment means that we realize we're living in critical times hard to deal with. So we're all in this together. We're not alone. Common traits that create this atmosphere include selfishness, loving money, unthankfulness, etc. Therefore, not giving in to these dark aspects of human behavior helps. If others have coped successfully, why not you?
So here are some other practical suggestions:

Snapping a loose rubber band around the wrist is a reminder to snap out of hurtful thoughts because the brain can only concentrate on one thought at a time. So when one feels sad and is aware of the reason, it's time to snap that band and take action to replace that negativity with a positive scenario. It works. Try it, you'll like it.

Another help is the happy box. Whenever one's in a funk, bored, any depressive state, go to your happy box where you write about activities that occur to you as your life goes on. You'd like to do these things, but when you thought about them you were too busy to do them. So now you have a whole bunch or a few enjoyable activities on little slips of paper. Whenever that funk comes on, reach into that box and select any one that hits the spot.

A final thought. If you think about a person less fortunate than yourself, let's say a sick neighbor, an elderly one, an overwhelmed single parent, volunteer your services. It doesn't have to be much. Maybe a visit or a telephone call. But it will make you feel better.