stop after 20 years wile not finding something…… What do y mean everyone stoped serching the Higgs-Boson after 20 years ???

I think you'll find that they build new accelerators, built new detectors, upgraded the new accelerator...

They didn't just go on using the same tools, again and again and again. They paused the old experiment, improved it, tried again - and found it in the end.

Seti is not closing for good it is simply being halted for the time being to clear 20 years worth of results. And then rethink how we proceed after that. The blunt facts are that if we haven't found anything in 20 years "For whatever reason",,

1. There is nothing to find
2. ET doesn't want to be found
3. We are not looking in the right place
4. We aren't looking for the right type of signal
5. Our algorithms aren't up to the task.

How likely are we to find anything in the next 20 years, carrying on as we are?

There are currently 49 Boinc projects and 13 non-Boinc Distributed Computing projects.. They cover a multi discipline range of work from, maths, science, medicine and space and & Earth sciences.

Yes, the announcement could have been handled less clumsily, and with a gentle forewarning, of what might be necessary, but that is by the by. Seti may have become to some a way of life like a religion or creed, but it is simply a successful scientific project, that is taking a much needed break. No need for hand wringing or angst.

https://en.wikipedia.org/wiki/List_of_distributed_computing_projects