If you think it is time to move away from your Outlook mail account, this is the best way to do so, IMHO:
1. Set up a mail client. By using a mail client, you can work with multiple mail accounts and gradually move your communication from one account to another, while retaining your mail history locally. Personally I use Vivaldi this way, but there are other mail clients as well.
2. Select a new mail service. Good choices include Proton Mail and Fastmail.
3. Enjoy!