I am searching for slail vine plants or seeds but I could not find even one through the last two years. Every one says the weather not helped.... Could you kindly advise me where should I adress?
We do not recommend specific places to purchase plants. I can recommend checking online places such as Amazon, Etsy, or Ebay. They may have what you are looking for.
We give regular water and fertilizer
You may want to consider propagating the plant from cuttings and see if the new plants produce seeds.
Here is an articles about snail vines.
https://www.gardeningknowhow.com/ornamental/vines/snail-vine
My snail vines are dying in the Arizona Heat. How often should I water them and do I feed them fertilizer?
Watering should be done when the soil dries, completely, down to about 2 or 3 inches or so, instead of on a schedule. They can be fertilized once or twice per year, but this is not necessary.
Here is an article that will help you to care for the vine:
https://www.gardeningknowhow.com/ornamental/vines/snail-vine/growing-snail-vine.htm
I don’t know what to do to make it beautiful like it was
Unfortunately, your photos did not come through. I am unable to assess the situation. There could be many things that could be the problem. Luckily, you can test for some of them, and your local extension can test for others.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm
This will help you to find your closest extension service:
https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm
This article will give you a little more information on your plant:
https://www.gardeningknowhow.com/ornamental/vines/snail-vine/growing-snail-vine.htm