That would be pretty wasteful on the Tor bandwidth, unless it is necessary for you to hide your Lemmy activity from the glowies. Realistically all you would need would be a VPN, but I do not think our IPs are publicly accessible on Lemmy, and only visible to the instance admins, so another not so worrisome worry. All in all, just limit what you share and how much of it you share and you will be good.
Currently I do use a VPN, though it’s not because of Lemmy that I do so, it’s the general threat model that I made which causes me to use a VPN. I do not recommend it to others which have no use for a VPN, specially if they have not made a threat model yet.
Remember, OPsec is what kills privacy and creates linkability, something which you do not.
Using Tor one of the best ways to be anonymous online, but this only works because everything becomes randomized all the time. However, all these protections become useless when you create an account and then use tor on it: they know it’s you because you’re the only one who owns that account. But all this doesn’t matter until you start sharing public info that is linkable to your private/personal identity, making anything else in this world to anonymize you useless. Like I said, tor isn’t a “instant privacy with no downside” as everything can crumble down with a simple OPsec error.
So, if you are interested in privacy there are a couple resources which will help :