Q.Clivia problems
The tips of my plants turn brown and dry up. The plants need repotting and probably division, these plants are large. However, I have small plants in a greenhouse that I started from seed, these plants really look sick, yellow leaves that do not turn brown. I planted them in orchid mix soil. I could maybe send pictures? I also have trouble getting rid of extra plants,,people do not have room for them. Marge Farness

Clivia may need repotting every 3 to 5 years. They do not like to be repotted and will not likely bloom for a few years after.
Yellow leaves may indicate watering issues; too much or too little.
It could also be pests, disease or growing conditions.
This article will help refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm
Try contacting a local garden club, they may have members that would love plants.