My name is Bohdan Dovhan, I am Salesforce Practice Lead in Lviv, Ukraine.

https://www.linkedin.com/in/bohdan-dovha%C5%84-2b791914/

You might benefit from by free Bof Per Man package listed in AppExchange https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000FtWcBUAV to bulk edit object and field level security.

Some service to generate a package.xml for an org and retrieve all metadata (works if it is quite small): https://test-site.secure.force.com