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I have a very old forum that still gets a lot of traffic, but when migrating over to another software that is cloud based we cannot redirect using same domain, SO the only option would to be to change the cname on a subdomain and then REDIRECT all the traffic from the ROOT domain permanently - would this be a bad move as the root domain wouldnt be used anymore as now its just setup to be redirected in order to use the software we need to use? Domain is 17 years old.

I have this forum with about 2 million posts for 16 years on root of the domain. I am looking to switch softwares but the top ones won’t help setup 301 redirects. But I can still migrate all my members and all my content (threads/posts), would Google still reindex all our content or if we don’t setup redirects would it really kill our entire traffic for a long time or maybe just a month or so? I really want to migrate to software that isn’t forum based but rather something that offers courses, chat, live video streaming, subscription based etc. and this is the only way to do so OR to set it up on an entirely new domain OR subdomain but to me that is like starting all over from scratch? I could archive the forum to read only and set it up on subdomain or another root domain - then on the archived forum setup banners and a pop up linking to the new site or new subdomain? . This is such a hard decision for us as the current forum we have had for so many years has lost members posting from 1k a day to just a handful a day, our fb group though gets 1k a day so I’m trying to revive a site into something more modern and has all the training features we can offer as well.