Last year I had my field lines replaced BC I had issues with everything backing up. Guy said it was roots. Well this year we had a lot of rain where the area where the field lines looks like there is standing water which it makes the plumming act up inside. Toilet etc... I don't remember having a issue with rain in the past with the old lines but it has been a lot more rain than normal. I just want to be able to flush the toilet lol

If the drain field is saturated you will fill the tank up and the system will back up. No easy solution except regrading to get rainwater out of drainfield.