I do not support the use of Google, and therefore I highly recommend at least getting rid of your Gmail accounts.
My #1 choice for encrypted email services. Tutanota is an open-source privacy advocating company from Germany focused on protecting human rights, and secure use of emails. Tutanota offers totally free encrypted emails, however, if you want multiple accounts, or to use it for businesses, you are required to pay a monthly subscription.
ProtonMail is a widely used and recognized company from Switzerland providing both encrypted emails and VPN services. The platform lets users have a free encrypted email and VPN accounts with limited features, and if you require more features and benefits, a monthly subscription is required.