[tor-relays] Questions about Fallbacks

Hi,

when i setted up my relays i choosed 443 as the ORPort. My thought behind it was that 443 is most likely not blocked and less likely observed because the ISP could expect to anyway only see encrypted data so a Tor connection will more likely slip through it.

I let the DirPort on 9030 because i read that clients anyway only use the ORPort and i thought if a authority will connect to me it makes no difference because none of my ports is blocked.

Now some of my relays are Fallbacks.

Would it be a benefit for the network if i change the DirPort to 80 or is the DirPort still not used by clients?

Is it necessary to opt-out the relay as a fallback if it was shut down by the provider and already is long gone from metrics?