user105948: I am thinking of sending some BTC to a new BTC address, but do not have complete trust in that new one. 
I'm sending to someone else, but want to be sure that if I do, they can't access other people I have used the same BTC wallet to send BTC

user13866: You might want to consider finding a reliable Bitcoin Tumbler (Bitcoin Mixer).
But be aware that you are placing trust in a third party, especially for custodial mixers. Some people have lost money to fraudulent mixers. I would do my research into a company very carefully before risking using them.
Some wallets have mixing capabilities built in to them. These may be a better option.
One example of an article on the subject is How to Mix Your Bitcoins Using Coinjoin for Greater Privacy -- but I can't vouch for the correctness of this article. I suggest taking the time to do your own research.

105948: <p>I am thinking of sending some BTC to a new BTC address, but do not have complete trust in that new one. </p>

<p>I'm sending to someone else, but want to be sure that if I do, they can't access other people I have used the same BTC wallet to send BTC</p>
 13866: <p>You might want to consider finding a reliable <a href="https://en.wikipedia.org/wiki/Cryptocurrency_tumbler" rel="nofollow noreferrer">Bitcoin Tumbler (Bitcoin Mixer)</a>.</p>

<p>But be aware that you are placing trust in a third party, especially for custodial mixers. Some people have lost money to fraudulent mixers. I would do my research into a company very carefully before risking using them.</p>

<p>Some wallets have mixing capabilities built in to them. These may be a better option.</p>

<p>One example of an article on the subject is <a href="https://news.bitcoin.com/how-to-mix-your-bitcoins-using-coinjoin/" rel="nofollow noreferrer">How to Mix Your Bitcoins Using Coinjoin for Greater Privacy</a> -- but I can't vouch for the correctness of this article. I suggest taking the time to do your own research.</p>
