connecting 2 different wifi networks on different routers

Hi friends,

I have 4 floors and two wifi connections. Comway and anonet. Comway is setup on 3rd floor and through it, i have taken a cat 6 cable and joined a router on my 4th floor, then i used another cat6 cable which is going down to 2nd and 1st floors to connect 2 routers in a series. But as comway broadband was giving problems, i took another connection of anonet and got it installed on the 1st floor. Now I have two routers installed of two different companies on the 1st floor.

Now can i do a setup by connecting both of them together such that if one gets disconnected, i can use the other service provider on all the 4 floors ? I can connect them together using a CAT6 cable. Moreover, I have one jio router lying unused (if it can be used somewhere).

If yes, pls tell how to do it.
 
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