Hello there :), WordPress noob here. I own a website made with wordpress (www.casadelasletras.es) which has been running just fine for a while now. A few months back however i started seeing some weird behaviour from time to time. When accessing the website, I was randomly getting redirected to another webpage which seems malicious. After exiting the tab and accessing the webpage again, the redirection does not happen anymore for a week or so on that device, so in order to see it again you either have to wait or swap to another device.
I ve tried pretty much everything I could think of: removing all uneeded pluguins and sticking only to reputable ones, updating all of the plugins to the latest version and checking the server for malicious code. I also downloaded the code from wordpres to try to search for some errors or malicious lines of code I found online, but none were present. For the record, I also received a google email stating "[Security Alert]: Issue for Google Maps Platform" but I do not know if this has anything to do with this issue.
Does anyone have any idea on how to solve this or what steps should I take now?
Thank you very much 🙂
Here is the malicious webpage i get sometimes when accesing my own webpage (www.casadelasletras.es)

Your site may be hacked. Are you able to login to wp-admin? You can scan with Wordfence or Sucuri, check .htaccess and wp-config.php, scan your database, update WordPress, themes, and plugins. If not fixed, restore from a clean backup.