The team set-up looks fine. Mine is similar, except that instead of Ezio I am using Brogni so I get double the shield growth and take advantage of his block debuffs. Wixwell's talents let him grow the shields based on how many buffs are on your champions. One recommendation I would make is to see which champions offer the most buffs to your own champions and use them maybe in place of Ezio. Someone with block debuffs would be great, or even someone that can add multiple continuous heal buffs as those stack. My champions have between 7-8 buffs each. I don't know if there is a max number of buffs, but if you can increase that, you should be able to survive longer.

well for starters, are you using a shield set?

2ndly are you fast enough,does wixwell have reflex, and are you building him with Max Defence since his a3 is based on defence?

3rd your not running relentless/perched shadow or any other kind of ability that would grant someone an extra turn that they out run their buffs.

4 drop the ezio and add someone with inc speed. if that works that was your problem and it was a speed issue where you needed at least 30% maximum more on your wixwell

5 your turning off the buff moves on your buff extenders after the first turn. (intercept is a stack not a buff so it actually does not count towards the total of how much the shield is buffed but takes the spot of a real buff)

 6 godseeker brings no buffs, so a valerie (farmable rare), anchorite, or just about any other buff extender brings more value than aniri since the rest have buffs of some kind although demytha is kinda the 2nd worst since her buffs cant be extended so in a 3 buff extender team she has to keep the a3 on for faster shield growth.

This is about all the solutions I can think of to solve your problem, in an infinity team you only need 1 nuker or damage source, so geo is more than enough to do 100M+ damage (as long as his shields start with good values and grow in proportion. In reality all that matters is gettting 71m and thats it, use trash gear and save that team and use epics that you dont use anywhere else.

I had a geo team with 3 extenders and a wixwell with 240 speed reflex and everyone else was like around 220 or w/e and geo at 190 that wouldn't make it to turn 1000 but it would get 100m unm but if I threw in a khatun or inc speed my team would survive 1000th turns but i didnt really care about the survival as long as i got the damage on all afinities but I would suggest making sure your wixwelll def is like 5k+  for his initial shield otherwise you need speed to compensate, also magma shield or volcardiac heart can act as a 3rd shield so pelops is also an alternative for ezio

When I was try harding wixwell team damage I was able to get to 600m with a ninja comp and better speeds/inc buffers, more damage based buffs.

THe max is 10 buffs or stacks in combination and intercept along with some other things are considered stacks rather then buffs that will not add to the shield growth, for instance in my titus team I realized when he had intercept it was a 9+ buff growth instead of 10