Everything has its time
Let's start with the pressing problem - transplanting at the wrong time. Like people, plants have their own biorhythms. They, so to speak, hibernate for the winter and wake up in the spring. That is why you can't transplant flowers in winter or during flowering - this is a huge stress for them. It is best to transplant in early spring, when active growth begins.

Size matters
Another common problem is the wrong size of the pot. Some people believe that the bigger the pot, the better, it is embedded in our subconscious. In fact, if the roots do not have time to master the entire space, this leads to root rot. The only optimal solution is to choose a new pot that is only 2-3 cm wider than the previous one. This will allow the plant to develop comfortably without the risk of moisture stagnation.
Fertile soil
A universal soil can also be a mistake. Not all plants feel equally well in such soil. For example, cacti and succulents need light, sandy soil, and orchids do not tolerate ordinary soil at all - they need bark or a special substrate. For violets, it is useful to add peat to the soil to ensure the required level of humidity.

Even if you did everything correctly, the plant may be a little "capricious" and react to the transplant with stress. During this period, you should not put it in the bright sun, because the weakened roots are not able to cope with the evaporation of moisture. It is better to leave the plant in the shade for 5-7 days and periodically spray the leaves with water with the addition of your favorite growth stimulant.
And the most important thing to remember: do not water immediately after transplanting! You need to let the “wounds” on the roots heal, so the first watering should be done after 2-3 days. If the leaves start to turn yellow after transplanting, you should immediately check the drainage – stagnant water near the roots can lead to the loss of the plant. Use it!