Managed to make @ maarten@ balliauw.be discoverable on Mastodon.
If you're interested in using your own domain for discoverability, much like good old e-mail forwarders, here you go: https://blog.maartenballiauw.be/post/2022/11/05/mastodon-own-donain-without-hosting-server.html
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@maartenballiauw will it make possible to migrate from one mastodon server to anher with keeping all the content?
@engelbart No. This will then just point to the new server. For transfers and all, see https://docs.joinmastodon.org/user/moving/