What are some ways to revive potted plants?

If the plants have been in the same pot for a long time, they would probably benefit from re-potting into a larger container with fresh soil. Alternatively, you could administer a low dose of liquid fertilizer each time you water the pots. Without more information, specific advice is difficult. What kind of plants are they, what kind of soil are they growing in, how often do you water, are they in sun or shade, what temperature range do they experience, are they indoors or outside?

Depends what type of plant it is. Some potted plants are really not tolerant of excessive summer heat, so at times I have to reposition some plants in a shadier spot. Some are just too thirsty, since they are grown in containers, so I have to step up watering during this long dry season. A lot of factors will influence it, humidity, watering, temperatures. We got varying growing areas, ours is very dry, much hotter, zero rainfall for about 6 months, while some areas elsewhere have much more rain.

Growing conditions change every season, so got to observe and adjust accordingly. My area is much drier and hotter, so some of my container plants rests a bit, appearing somewhat dormant, as it waits for cooler conditions to return in Fall. But I still water them enough to make sure the roots stays alive.

One thing I have learned too, if the plant is in obvious distress, do not apply fertilizers. Got to wait for it recover, otherwise it will just escalate the injury to the plant.