Returning player from 2019 - should I transfer my lvl 60s to Mirage Raceway (MoP Classic EU)?

Haven't played since 2019/2020 Classic. Just found my two level 60 characters sitting on Nethergarde Keep, which is now a locked Legacy server. I have a free character transfer available to Mirage Raceway (Full pop). My question is: is it even worth transferring at this point? MoP Classic is wrapping up in a few months and I'd need to level from 60 to 90. By the time I'd be raid-ready, Siege of Orgrimmar might already be on its way out. On the other hand, the characters are completely useless on a locked server, so maybe I should just move them regardless to be in a better position for whatever comes next (WoD Classic? Classic Plus?). Anyone in a similar situation or have thoughts on this? Is leveling 60-90 even that bad these days, or would I be better off just starting fresh on TBC Anniversary?