What key UX/UI elements should be in a web survey?

Question

User interface

Good afternoon,
I created a landing page on the site for conducting web-surveys in order to measure the convenience and ease of use of the site, as well as collect wishes about the product.
I show the link to the survey both on the site and send it targeted via SMS to user numbers.
The response rate is quite low. When analyzing the reasons, I found that a sufficient number of mobile users follow the link, but the survey does not pass due to the lack of adaptability for mobile users.
Now I plan to make a new form, but when designing, I want to take into account all the UX / UI trends in the field of web surveys.
What UX/UI elements do you think should be in a Web survey?
What best practices do you know?
What is the best way to do it - adaptive layout or two landing pages for mobile users and desktop ones with redirects?

Answer 1

Could you please provide a link to the poll.
Perhaps users leave the same way because they are afraid of the size of the survey. Break down a huge form into simple logical steps and immediately let's understand how big it is.
You can also encourage people to complete your survey - for example, give a discount or any other goodies (what are you doing there).
Another option is to replace the survey with a series of questions and show them one at a time on the main page. This will reduce the pain of people to a minimum.
There is quite a lot of material on forms now, for example:
https://designpub.ru/%D0%BE%D0%B1-%D1%83%D0%B2%D0%...
https://www.smashingmagazine.com/ 2018/08/ux-html5-...

Answer 2

The response rate is quite low. When analyzing the reasons, I found that a sufficient number of mobile users follow the link, but the survey does not pass due to the lack of adaptability for mobile users.
Now I'm planning to make a new one...

That is, they knew about the large number of mobile users and did not take care of them? You've lost some of the respondents because they won't come back.

What UX/UI elements do you think should be in a Web survey?

Checkboxes, radio switches and text fields if you give freedom of choice (it should be). Personally, I am against selects, they hide information.
A form with a large number of questions should be broken down into logical stages of its completion, the so-called steps.

What is the best way to do it - adaptive layout or two landing pages for mobile users and desktop ones with redirects?

And the design allows how to make it responsive or adaptive?