Just built this on arm64, seems to be running fine as well.
Unfortunately I'm not experienced with Go port maintenance, otherwise I would have updated to 0.13.0 as well.
Index: Makefile =================================================================== RCS file: /cvs/ports/www/gotosocial/Makefile,v retrieving revision 1.16 diff -u -p -r1.16 Makefile --- Makefile 11 Nov 2023 02:51:03 -0000 1.16 +++ Makefile 31 Dec 2023 15:13:41 -0000 @@ -1,5 +1,4 @@ -# has deps that can build only on OpenBSD/amd64 -ONLY_FOR_ARCHS = amd64 +ONLY_FOR_ARCHS = amd64 aarch64 COMMENT = ActivityPub social network server