Have you heard about #BridgyFed? Using this free service, I have been able to link my #Substack publications to the #Fediverse so that each now has a handle that can be followed on #Mastodon and other #ActivityPub platforms. Here they are:
sports: @sportsguysean.substack.com
Glengarry county: @glengarry.substack.com
general interest & opinion: @seanbray.substack.com