10:15a Neither do we boast beyond our limits in the labors of others.

We (excl.) do not boast beyond limit, that is, in the labors of others.
-or-
We do not talk proudly ⌊for selfish gain⌋ about work/ministry done by others, since such talk is outside of what is proper.

10:15b But we hope that as your faith increases,

As your (plur.) faith/believing becomes stronger, we expect that
-or-
As you believe ⌊in Jesus⌋ more and more, we have confidence that

10:15c our area of influence among you will greatly increase as well,

our area of influence among you may be greatly enlarged, (English Standard Version)
-or-
our work among you will grow/extend greatly.

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