The thing i personally think people should be focused on is compartmentalizing their internet activity. Cross-site tracking is pretty much everywhere these days. So if you have a twitter, instagram, lemmy, reddit, pintrest, whatever it is you do online. If you do not want your activity on lemmy to be linked back to those accounts you should be using a different browser for lemmy, preferably something like Librewolf. Privacy focused. If your really feeling paranoid go ahead and use TOR browser to login to lemmy. Assuming they dont block TOR connections here I've never tried.
Burning your accounts not a bad idea either. Back when i used reddit id make new accounts regularly and never use the old ones again. With lemmy i dont bother tho. Even if you make a new account regularly on a site as small as this its pretty easy to see if an account showed up around the time your old one went inactive and then followed all the same communities your old one did. Not a big assumption that is your new one then. the way you type, and words you use can also be fingerprinted and used to ID you across accounts. Of course you can take steps to prevent this type of tracking too if you want.
If what you want tho is to not get some chud sending you death threats thats pretty easy to accomplish. Make yourself a new account, dont post any personal photos, and only give very vague information about yourself. For example, How old are you? I'm in my 30s, 20s, etc. Dont say the exact number. Whats your name? Its Xiisadaddy as far as your concerned. Whats your gender? Irrelevant need to know only. Chuds arent that smart. They can only find you if you hand it to them on a silver platter.
Now let me see if i can find out some info about you from this account: Based on your profile just a quick glance tells me, your a woman, live in australia, seems like maybe you or someone you know was in the military, you live in an area with public transport that isnt good, a food desert, your landlord has a meth test cause in your lease, probably live in an apartment building, you have a niece, and siblings, and are autistic. I'm guessing late 20s, early 30s? Took me maybe 10mins to get all that. Don't feel like putting in more effort, but yeah id say you need a new account. Thats some pretty specific stuff an internet stranger just found out about you in 10 minutes. (reply to this and let me know if you want me to delete this comment btw so its gone too if you decide to get rid of your account)
Funnily enough ive been considering making a new one too this might be what pushes me to do it.