Very Slow Wordpress Site and Can't log in to the wp-admin

[tmacpowertools]

My site is tmacpowerstore.x10.bz ans the problems are:

1.) My site was fast yesterday, but today it is very slow. Yes the front page is fast but when clicking links it is a nightmare.

2.) Logging in to wp-admin was a nightmare as it returns a 500 Internal Server Error and it says the error is Timeout on the server.

Please Help me

 

[tmacpowertools]

Update: WordPress now announces a critical error. So I removed Wordpress and temporarily redirecting everyone to my Lazada Shop.

Anyways, what is the best platform you can recommend to use for Online Product Selling on X10 Hosting that is available on Softaculous? I formerly use Woocommerce because Wordpress is a headache to me.