Forced to use Facebook to interact with local groups and businesses. How do I keep my data safe?

I'm a big advocate for data privacy and I left Facebook many years ago without feeling the need to go back. However, there's several local groups and a couple of local businesses that specifically communicate via Facebook that I'd like to interact with.

This presents a problem - I have to use the platform to interact with these people but I don't want to use the platform. So how do I keep my data safe from Zucks greedy hands? So far I'm thinking:

• use a throwaway email or email that is specifically for fb
• only access via Firefox inprivate browser and use addons to clean cookies after every session
• utilise ad blockers in said browser
• set fb privacy settings accordingly to opt out of ad personalisation, othrr site fb logins etc
• potentially only access via VPN but that might be cumbersome
• maybe do all of this via android work profile but not sure if that's much benefit

Anything else I can do to remain reasonably safe?