What do you need to do first?
You need to modify the .htaccess file in the main root of your WordPress directory.
# START LiteSpeed Timeout Solution
php_value upload_max_filesize 128M
php_value post_max_size 128M
php_value max_execution_time 300
php_value max_input_vars 3000
php_value memory_limit 256M
<IfModule Litespeed>
SetEnv noabort 1
SetEnv noconntimeout 1
</IfModule>
set_time_limit(1500)
# END LiteSpeed Timeout Solution
Once completed make sure you refresh your page so it uses the new rules from .htaccess
Your issue should now be resolved!