For every additional transaction on one address, more conclusions about you, as owner, can be drawn. Always consider to have a new address instead of address re-use.
Wallets are bigger than addresses and one wallet can have many addresses.
If you use new address in a same wallet, it can be connected with each other.
A better practice will be use a new wallet for a new business and new purpose. Don't use one wallet for many business transactions.
https://blockchair.com/bitcoin/privacy-o-meterGeneral guidelines for sending BTC transactions
Blockchair can not help you improve the privacy of your transactions but here are some basic recommendations on how to stay anonymous on the Bitcoin network
Don't send round numbers
Don't send round amounts. Instead of sending 0.1 BTC, send 0.10125
Use Bitcoin Mixers
Mixers add an additional layer of privacy to a transaction to avoid exposing user identities.
Avoid reusing wallets
Don't send your Bitcoin change to the same address you use for sending bitcoins.
Avoid including many of your addresses in one transaction
Any time you can, try not to send BTC from your various Bitcoin addresses.
Avoid using "send everything" option
If you are withdrawing funds from an exchange, it is okay.
If you're moving funds to another wallet, do not transfer the whole amount to another address. It greatly compromises your privacy.