Hi there @levanmirvelashvili,

There are different things that you could do to optimize your server:

• As the $5 Droplet has 1GB of RAM I could suggest starting with adding a SWAP file so that you could have some buffer. You can follow the steps on how to do here:

https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-20-04

• After that, if you are using Nginx as your web server, you could follow the steps on how to optimize it here:

https://www.digitalocean.com/community/tutorials/how-to-optimize-nginx-configuration

• Then make sure that MySQL is also optimized by following the steps here:

https://www.digitalocean.com/community/tutorials/how-to-optimize-mysql-with-query-cache-on-ubuntu-18-04

• Another thing that I could suggest is going through this tutorial on 5 ways to improve your setup:

https://www.digitalocean.com/community/tutorials/5-ways-to-improve-your-production-web-application-server-setup

A few other things that I could suggest:

• Make sure to use a CDN to offload some of the load from your server
• Optimize your website, if you are using a CMS like WordPress, make sure to install a caching plugin

Hope that this helps.
Regards,
Bobby