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As for finding more coin upgrades all I can say is try and explore previous areas for any puzzles/secret areas you missed.
https://steamcommunity.com/sharedfiles/filedetails/?id=1726894492
https://steamcommunity.com/sharedfiles/filedetails/?id=1726894430
https://steamcommunity.com/sharedfiles/filedetails/?id=1726894381
For the underground bit, you are required to use other equipment which you already have.
You can do this BD!!
It says it right there on your screen, it's the new thing at the end of the toolbar at the bottom that looks like a chest, but it's greyed out because you haven't activated it yet.
Check the walls, how these bricks look. One of them is a bit different.
https://steamcommunity.com/sharedfiles/filedetails/?id=1726992521
Hints:
This involves using your most recent tool
And You need to be locked from outside