Which Visa is appropriate in my situation?

I have visited China several times since 2013, on tourist visas.
In 2016, I met a Chinese lady and we developed an ongoing relationship.
I had been given 12 month Travel visas on a few occasions.
I was given a 12 month Travel Visa in Dec 2019, but had to return home in Feb 2020 for an unexpected personal matter..
So I have only seen my lady friend via Wechat for a bit over 3 years now.
I have been waiting for the rules to change so I can go back.
I am preparing to apply for a new visa but dont know whether to apply for a Tourist visa or go using a Letter of Invitation.
I really want to get a 12 month visa, like on previous occasions.
I tried phoning the Visa Cenre but they dont answer the phone!
Im not sure if it would be a positive or a negative to mention my our relationship.
We have been a (unmarried) couple for about 7 years now!
Because of the effect of covid, her business sales have reduced quite a lot, so I am the primary provider for the family....2 children, one in high school and one in University.
Do you have any advice for me?