Tenant Refuse Rent Increase

[Marcus House]

I have a tenant that has been renting from me for 32 months (was a 2 year lease) without ever contacting me for maintenance the entire time and on time with rent every month.  After realizing their lease was expired for a while now, I recently reached out to them to have a civil discussion on the next steps.  Bottom line is they reject the idea of signing a new lease at a higher rent in any amount.  Given that it is still cold outside (don't want to take on the cost to winterize the property) and I want to take some time to think this over (while enjoying great positive cash flow), I told them we will just leave it as a month to month as is and either party will provide 30 day notice at any time to vacate the property.  I am likely going to give them 30 days notice to vacant the property in the Spring of 2020 but would like to get input from others.  How do others in the community think I should handle this.