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Dear all,
this Tachinidae we found in La Paz on 13.10.2019 at an elevation of roughly 3800m. Thanks for the help.
Best
Alex

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I can't tell from this angle. There are a lot of bristly Tachinidae in the mountains of South America, mostly in subfamily Tachininae. The bristled sternites may be a clue. If the tergites have bristles next to sternites consider Hystricia but these bristles appear to be on the sternites.

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It turns out many South American Tachinini have spiny sternites, and your fly is likely in that tribe.

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Thanks a lot, John for your help!
Best,
Alex