It is easy up to here
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3--|8--|712
7--|4--|--5
5--|-17|49-
9--|72-|5-6
--5|1--|9--
6-3|594|--1
159|-4-|--7
4--|---|1-9
-3-|9-1|---
Now you may see that in the top right mini grid (3X3) rhe only six candidates are in the second row. Therefore the 6 candidate can be removed from other squares in that row. You can now fill in some more number easily untill you come to
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3--|8--|712
7--|43-|--5
5--|-17|493
9--|72-|5-6
--5|1--|9--
6-3|594|--1
159|-4-|2-7
4--|3--|1-9
-3-|9-1|---
You now have a naked pair in the top righ 3X 3 and so can remove a few more candidates.
The 7 candidate can also be removed from (r8, c2) as the only 7 candidates in box 4 are in the same collum
I will work on it