Are you even allowed to kick tenants out during COVID?
Assuming COVID moratorium does not apply, this is very much dependent on local laws. So you would be much better off talking to a local lawyer on this.
If you want to state a reason, perhaps invent a reason why you need the space yourself to live in. Maybe something like "I need to work from home and need to set up a home office/bigger home office"? I know this (=landlord needing the space himself to live in) is a valid reason to kick out even rent controlled tenants in NYC - possibly one of the most tenant friendly jurisdictions in the country.
If the tenants leave without hassle then the reason should not matter. If, however, it blows up and gets into lawsuit territory then having a solid, lawyer approved reason, or a "no reason" if appropriate for your legal jurisdiction, can save a lot of time and money.