I have been using email clients for years and don't want to go without.
Mostly Thunderbird (TB), recently Betterbird (BB) which is a fork off TB and seems to work better (TB "lost" = doesn't display some folders anymore, BB shows them all).
You can also import the local folders created in TB into BB which is a nice feature.
On my Android smartphone I installed Aqua Mail Pro, very reliable and customisable.
Some years ago I created a new email account with https://posteo.de/en which keeps my inbox almost completely spam-free - no idea how they do that where other email providers let all incoming crap through. Highly recommended! And very cheap: Only 1 € per month, and worth it!
Why I mention posteo.de? Because they have a fantastic webmail site which you can use instead of an email client such as TB!