You have a lot of choices here: You may pray an informal prayer, sit in silence, read a book, pray the rosary, meditate on the Eucharist, contemplate the saint’s lives, just clear your head, listen to a recording of your favorite Catholic speaker quietly through your headphones, etc.
The key is general reverence with an emphasis on quiet. This is not a competition to see who can be the most pious, but this is YOUR personal time with God. As Father John Ricardo says, “Just waste some time with Him.” If God was not behind the veil of the Eucharist, what would you do? Christ says we are no longer servants but friends, so just spend some time with your friend. He loves you and is calling you.