First of all, ascendant means: describing things that are developing vigorously and will not stop for a while. You can make a sentence like this:
1. I wish our friendship will be in the ascendant!
2. I hope that my personal career will be in the ascendant.
3. The working class struggle in European and American countries is in the ascendant.
4. Our cause of reform and opening up is in the ascendant, let us roll up our sleeves and work hard!
5. Our online store has been established for more than a month and its performance is booming. It is really in the ascendant!
6. Winter long-distance running and square dancing activities are in the ascendant in our city, and citizens’ awareness and enthusiasm for healthy exercise are rising.
Ascendant has many synonyms, such as thriving, thriving, and rising like the sun. When making sentences, you can associate the semantics of the synonyms to make sentences