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Use a second SIM+number exclusively for all 2FA that is not publically known (ie, not shared with friends or family or used for chat apps). They can't really SIM swap you if they don't know your number.

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That doesn't help if the attackers manage to social-engineer telcos using other public information such as your name.

Yes. It does make it much harder though. They'd have to try every telco. Bonus points for using an online/obscure telco or sms relay.

Still vulnerable to a breach that exposes user data at any one of the services you've signed up for, unless you use a separate SIM for each.

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