You will need to redo this part of the run
It appears that part of the run does not meet minimum burial specifications (aka the 18" cover depth required for PVC conduit); also, that LB and several of the bends will need to go in order to avoid violating the 360° rule between pull points and keep the LB from becoming inaccessible.
As a result, you will need to redo this section of the run completely. The first step will be to turn off the breaker in the house and disconnect the wires at the house end, then go to the garage and pull the wires out of the conduit completely from that end. Then, you will have to excavate along the conduit from where it enters the ground down to where it meets the 18" cover depth (and a couple extra inches), as well as excavate out a 19-20" deep pit around the wide-sweep elbow below the LB, and connect the two excavations with a 19-20" deep trench in an L shape overall (draw straight lines out from where the conduits go, and then trench along those lines, yielding two trenches that cross at roughly a 90 degree angle).
Once you've done the trenching, you can then install new conduit as straight runs of 1/2" schedule 40 PVC fitted to the existing runs using couplers at the ends and with a wide sweep elbow used at the bend. Backfilling the trench is straightforward, and then you can pull the wires back through, probably with the aid of a pulling string sucked through the conduit with a shop-vac and a plastic grocery bag tied to the string. Once the wires are back in (you should have sufficient length in the existing wires to reconnect them given how much length was taken out by removing the needless depth variations), you can then reconnect them at the house end, turn the breaker on, and call the job done.