Looking for 'good' (reliable) Outlook for Mac email client alternative

Hi all! I'm looking for a 'good' (reliable) Outlook for Mac email client alternative. As I'm sure you all know, there have been a myriad of issues over the past few months with Outlook, and I really can't deal with it anymore. I know there are good email clients like Thunderbird and maybe even Apple Mail. However, I would also need to know how to copy over ALL of my current emails, most of which are in a LOT of folders under 'Mail Import' in Outlook. I have the Olminator app which might be helpful, but I'm just not sure about all the ramifications and possible drawbacks in attempting to do this. I've been using Outlook for Mac for many years, but it's just getting too frustrating. Just so you know, I have a Verizon email address which is unfortunately being hosted on AOL's servers ever since Verizon left the email hosting business. Thanks in advance for any information you can provide.