What tool do I need to use for this specific Crankset (picture) FSA M17 38-41 Nm from Giant TOUGHROAD SLR 2

It appears to be a self-extracting crank, which means that there are two separate black pieces in there; the one that says LH and the one that says M17. The arrows show how they have different thread directions.

The 'LH' piece is the self extractor. It tightens left hand thread with a pin spanner, but as it hasn't shaken off it is probably tight so if you don't have that tool then don't stress it.

The centre piece with M17 and a right hand arrow is the bolt that actually holds the crank on, and has some kind of tool flats in that central hole, probably for a large hex key. Turn this clockwise with the appropriate size hex key (10 mm? +?) and torque up to spec (38-41 Nm).

The self extracting aspect means that if you turn this centre bolt anti-clockwise instead, it will pull the crank off.

Once tightened then monitor for loosening issues, if it loosens up again then something may be damaged.