Self-custody vs. Taxation: Does keeping BTC BTC in my own wallet really protect me from being tracked by the IRS?
Yes, you can be tracked because you make use of a centralized exchange to buy before sending to your personal wallet, also all they have to do is to use the blockchain in tracing your transaction made and they already have your KYC information with them, but if you don't want to be traced, avoid centralized exchanges and use a decentralized one, you can also make use of enhanced privacy mediums in cryptocurrency like bitocincore, and so on.
Privacy: Should I migrate to wallets like Wasabi or Samourai (CoinJoin) to increase anonymity?
They are not bad, but here are most recommended for this same purpose.
Wasabi wallet
https://wasabiwallet.io/wallets security and privacy mega threads
https://bitcointalk.org/index.php?topic=5509759.0Open Source Hardware Wallets
wallets for security and privacy
Bitcoin CorePassport ElectrumSparrow Bluewallet
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