Church only opens doors on Sunday.

This is a mistake, let me explain.
Every church in every city and town opens at the exact same time. Sunday, 10:00am - 12:00pm.
They are conflicting with each other. When someone tries to make a new church, they are conflicting with the schedule.
Everyone already has the church they attend. When you want to explore other churches, its very very slow.
They Shoud Not Open On Sunday Only.
If you had trouble starting a church because of the lack of participants, then maybe you can try a different day and time.
There are 7 days to a week.
If your church is opening not on Sunday, and the other churches do, people from those church, if the will, can visit you. They can still attend their church while seeing yours.

The building is not a church, just a meeting place.
Buildings are not necessary but are convenient when you have too many who want to gather to meet in a house.
The people are the church, even when they are not gathered together.
We gather to study together, to pray together, to sing together, to fellowship and worship together.
We gather at least 3 times each week in a building.

Ask the Lord where He wants you to go, we are to take ALL things to Him for His guidance.
Serving the Father isn't like picking a restaurant.

Unfortunately modern times are convoluted we lead independent lives we are tied to family responsibilities needs wants and so on.
Most of the time we leave God on the back burner just leaving Him in the background i wish i could just walk away. There is a bible apologist highly recognized in the world mostly by her "brethren" muslims. She lives in the UK and cannot find a resting place and chooses not to. She will not take money from anyone. She walks with faith and God takes care of her. She is a pillar of light in this dark deceiving world. Hatun Tash is an ex muslim from Turkey.

The churches in cities are open almost 24/7.
The further away you go from the cities, the less open they get.

A church is not a grocery store. If you like your current one enough that you are concerned about maintaining your image there, why do you want to go looking for a new one? Just to see if there is something better that you are missing out on?

A church is also not a job. If you want to go to a different church, why would you care about being absent from the church where you are currently going? What requires you to attend services at your current church instead of going to a different one? Will they dock your paycheck?

I am not sure where you get that every church has the same times. NOPE! Not hardly. The church I attend meets Sunday afternoon at 3 PM. YUP! A time when most churches are closed.
Plus, we are a rather small congregation so we have to rent meeting halls and sometimes the hall gets rented before we have a chance to rent it again so we will change to say meeting on Saturday afternoon or one time we met on a Friday afternoon at like 2 or 3 PM.
PLUS, Everyone I know of works during the week and the ONLY time they can even attend church is over the weekend and Sunday is always the best time to get everyone in one place.
Seems very simple to me. It is never an issue of Sunday being the ONLY day or considered the most Holy day. NO!

Why would you want to start a "church" consisting of people who already attend other fellowships? Would you not rather start a church with new believers?