As long as you are holding bitcoin and crypto on a non-custodial wallet, no one will be able to track you. I don't think that IP address could be an issue as ISP are usually not monitoring which sites or applications you are accessing.
False, non custodial wallet has nothing to do with privacy.
Electrum is non custodial wallet, but since it's lightweight wallet (SPV) you're connecting to someone server, not running your own full node.
Actually if you want to have 100% privacy, you must not let your ISP or government that know you're have a Bitcoin on specific address you used.
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If you want that your ISP does not know if you are accessing bitcoin wallets or centralized wallets/exchanges, then you should use a VPN.
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Masking your IP address via VPN is a bad idea, since VPN offer poor privacy. You need to use Tor.
Moreover most of exchanges are against of VPN usage and can't use Tor, the best way is use Bisq that run via Tor.