How can I remove macOS Ventura 3.2.1 and use previous update?

The issue you are describing sounds to me like you may have some form of malware on your Mac and nothing directly to do with the update to Ventura 13.2.1.

When attempting to access a website, but your browser is redirected to another one, is one sign of malware. As such, I suggest that you try the steps in the following support article:

• If Safari doesn't open a page or work as expected on your Mac - Apple Support

In addition, you may want to consider trying the "free" version of Malwarebytes for Mac to see if it uncovers any potential malware present on your Mac.

Lastly, I suggest that you run an EtreCheck report, and optionally post it here if you need assistance with interpreting its results. EtreCheck is a diagnostics tool which greatly aides in troubleshooting potential Mac issues and is developed by a respected forum member.

Ref: Using EtreCheck to Troubleshoot Potential… - Apple Community

Instead of downgrading, why don't you provide us with what the issues you are having with 13.2.1 so that we can try assisting you towards a solution? Otherwise, did you perform a backup BEFORE you updated?

I'm having a trouble with iCloud after update to macOS Ventura 3.2.1. The button for accepting iCloud terms and conditions simply doesn't work and nothing is uploading to iCloud because of that...

Check this blog it will help you to resolve it.

https://www.kbvtips.com/how-to-remove-macos-ventura-3-2-and-use-previous/