What kind? Have you read this thread or at least the very first post (which summarizes users' findings) to verify that your repeaters are one of the (very few) known to be "compatible" with Xiaomi Zigbee devices?
An alternative to what? As an alternative to Xiaomi devices, there are countless standard Zigbee (and Z-Wave and a few LAN) devices that play well with Hubitat. You can look at the official list of compatible devices, but most Zigbee (ZHA 1.2 or Zigbee 3.0) or Z-Wave (classic or Plus) devices of common device classes (motion sensors, contact sensors, smart plugs, etc.) will work with Hubitat out-of-box.
Or if you're looking to keep the Xiaomi devices but are looking for alternative way to use them, some people have created a dedicated Zigbee network just for their Xiaomi devices (and possibly known-good repeaters) to isolate them from problems caused by many standard repeaters. You'll need a second Hubitat hub plus an app like Hub Link/Link to Hub or HubConnect (I'd recommend the latter, though the former should also be sufficient for this limited purpose) to share devices between the hubs. (If you're feeling insanely adventerous, you could probably also use the Xiaomi Gateway with Home Assistant and integrate the devices with Hubitat via MQTT.)
If you mean something else, you'll have to be more specific. Good luck whichever option you take!
