i restored the DG droplet and i restored the website, the thing is now as per the attached screen when running wordpressYou're using the minimum required RAM. Indeed this can cause issues when the RAM requests from applications suddenly increase. You only have around 210 MB spare, that is probably not enough.

i have this issue only when i moved to digital ocean, on ionos no issue like thisi restored the DG droplet and i restored the website, the thing is now as per the attached screen when running wordpress
View attachment 23936
I know that Plesk working on must editions, it's not complain about Plesk, it's about to get solution for this kind of issue after migration, @Peter Debik was right, it's the memory need to be increase but in same time it's one small website, how it's possible to consume this memory? i don't know could be them core or plugin in wordpress.He is consuming SWAP like a hot cake, that is an indication of low random memory.
Plesk works in must OS editions without issues, however, be careful when you choose one.
I know you don't like to upgrade from 1GB RAM to 2G for just 1 website or 1 extra plugin but it's advised to upgrade if your website gets more visitors within small period of time.it's one small website, how it's possible to consume this memory? i don't know could be them core or plugin in wordpress.
yesIt's most likely a plugin.
Can this thread be considered "solved"?
thank you for understanding that, its what im trying to sayI know you don't like to upgrade from 1GB RAM to 2G for just 1 website or 1 extra plugin but it's advised to upgrade if your website gets more visitors within small period of time.
Another workaround is to use Cgroup to put hard memory limit on 1 Domain/Subscription to not affect Plesk and case that error.
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(Plesk for Linux) Cgroups Manager
A website on a shared hosting can consume all system resources and disrupt the performance of other websites. This issue is known as the “noisy neighbor problem”. Plesk Cgroups Manager is an extension that helps you address this issue by managing the consumption of the CPU, RAM, and disk read...docs.plesk.com
They solved your issue already, let them know it's solved.