You can't. It is really not a best practice to prospect with a @gmail.com or @outlook address.
Domains start below 10$ per year, find one that suits you and start from there. You'll probably need some hosting to create emails with that host, but overall budget should be less than 40$/year.
Landing in Spam depends mainly on your domain setup, and your reputation (domain reputation and/or IP reputation).
A good domain with a poor configuration can land even legit hand typed emails in Spam. It is pretty easy to land in spam, even when you are a Google Workspace paying customer...
Do you have DMARC, DKIM and SPF in your DNS records?
Scan your domain with https://easydmarc.com/tools/domain-scanner and follow instructions (you can leave BIMI in red).
I'm interested to know more about your two Health sites and your price. If you have a profile on Fiverr or else it might help finding out what you have to offer ;)
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