Don't reuse addresses, learn to CoinJoin and use your own node.
Read how to use Bitcoin Privately & the bitcoin wiki page
Samourai Whirlpool is a free and open source (FOSS), non custodial, chaumian CoinJoin platform. Its goal is to break all deterministic links, to providing excellent forward looking on-chain privacy from a mobile device.
Utilizing the same CoinJoin implementation as Samourai Whirlpool, Sparrow Whirlpool breaks deterministic links, providing excellent forward looking on-chain privacy from a desktop environment. Includes additional functionality, such as the ability to automatically mix out to cold storage.
Market based fee structure CoinJoin implementation.
End-to-end encrypted messaging over the Lightning Network