I had the same issue and only blew 2 SD cards in about 8 months, so I went SSD and so far so good. Mine does a lot more than just HA, but I would always end up with SD cards with read errors. They weren’t cheap either, opted for Samsung Pro or Sandisk Extreme memory cards.
As I was running Raspbian, I just dd’ed my backup image to the SSD, and fixed the boot partition to reference sda instead of mmcblk, and away it went with no issues.
The SSD and caddy ended up not being much more than a good memory card either.
Before anyone asks, Rpi official 2.5A PSU, Line Interactive UPS and milled aluminum heat sink case. No expense spared really. I wouldnt think to look at HA as the issue though, I just know that TBH SD cards are not suited to anything but read only / non-journaling operating systems (e.g. routers, thin clients, etc)