1. If you use it "normally" there's a chance that the transactions will get linked.
2. If you make a new seed in an Electrum under TOR, probably it won't be linked to the rest.
3. If you use your own Electrum server, then it won't matter you have a new wallet with new seed
or a new address in an old wallet and you take good care to not use it together with other addresses from that wallet,
in both these cases you're good (cannot be linked with your old stuff).
Obviously [2] is easiest for you. (You can look for Tails OS, it should contain an Electrum already set up with TOR, just you cannot verify it so I suggest you use it only with small funds.)
Wasabi is not bad, but my personal opinion is that's not for you, at least not yet, until you understand more here and there.
I've never used Wasabi. Imho you can mix better with actual mixers; imho you don't need each and every input mixed, so using Wasabi on a daily basis is overkill. Also at Wasabi you pay a (tiny) fee for the mixing (more than just the tx fee). And, as a horror story, this user has been using Wasabi without enough knowledge (well, Electrum too), and now he's missing money, he's lost and it's not easy to help him.