how to secure my vps?

Several months ago, my website was hacked and I lost everything. I want to know how to secure my website? and how to find holes in my vps before someone will hack me an other time?
thanks.

are you using wordpress? If so, then the WP is the biggest hole in your system

Hire a sysadmin or use runcloud
btw wordpress is probably the biggest reason you got hacked

lol yes I used wordpress and I'm using it for my new website, But every website right now is on wordpress and no one hack them. The other time I tried to host two websites on the same vps for now I will host only one on this vps and I minimized the number of plugins used. Is there any way to see the holes before the hackers?
I can't use sysadmin because I'am broke as fuck

Sorry to hear about the hack. That sucks.

- Minimize amount of plugins
- Have a strong password that you change every 2-3 months
- Don't use a login username that is generic, for example "admin"
- Don't use cracked themes or plugins
- Keep theme and plugins up-to-date
- Use Wordfence, with their login security activated so that you need your phone to sign-in
- Avoid unknown themes. Use something like Generatepress, Blocksy or similar frameworks instead of Themeforest themes
- Use Cloudways VPS
- Don't share your log-in details to anyone

These are the things I come to think of right now.