Thanks for reaching out, and thanks for choosing a WordPress theme by BoldGrid. I’m sorry to hear that you can’t log into your WordPress site.
I visited your site and I can see that there is an error, but right now it doesn’t look like debugging is enabled so it’s tough to speculate what might have gone wrong.
First, check your email account for an email from your website. Since WordPress 5.2, there is a recovery mode that you can use to get access back to your site if a plugin or theme has caused an error, and there will be a link to log into your site with the offending plugin or theme disabled.