Many people forget about this nuance, but you need to start with it if the flowers have stopped delighting you with new buds.
There is no need to rush with fertilizers if the soil in the pots has not been changed for a long time.
Healthy and fertile soil is a source of life for indoor plants. All that remains is to water regularly and no fertilizers are needed.
There is no universal answer for all plants. Fast-growing flowers (violets, begonia, hibiscus, etc.) need to be replaced annually.
Cacti, sansevieria (mother-in-law's tongue) and other slow-growing plants can be replanted every two years.
The best time to replace soil is early to mid-spring.
If the plant has outgrown the old pot, then the container must also be replaced.
A pot that is too large is not required. The best option is one that is two to three centimeters larger than the previous one.