wordpress site down after updating it

Hello,
Last Saturday i was updating my website with following steps :
1. i took backup using updraftplus
2. i updated all plugins
3. i changed the PHP version to 7.2
4. started updating my word press site
and it showed some installation error which i am not able to recall. Post error nothing on dashboard was working. So i refreshed my page and then on my entire website is down .
Just a white screen appears. I couldn’t even login to my dashboard.
I tried finding the .maintenance file and also renamed the plugin folder.But this is not working.

What else can i do

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