If it is a subscription that is going to expire and you can't afford to renew, why not drop down to Avast free. When you elect to use the Control Panel > Programs and Features > Uninstall - select Avast Antivirus, when you do that it should give you the option to install avast free.
I have been using avast free for over 15 years and it suites my needs.
I'm assuming you aren't on the automatic subscription renewal scheme ?
If you are you would need to disable that option or the automatic payment authority would kick in.