My first impression is that the crank, bottom bracket shell and chain are filthy. This bike need proper servicing and cleaning. It's way past due.

Don't do anything until the crank is removed and cleaned. Check the chainrings for wear, gouging, etc., and make a determination whether or not to replace worn parts (bolts or chainring(s)).

Test the cartridge BB bearing for wear or play. Likely it's okay, but verify this.

Thoroughly clean the bottom bracket shell area, front derailleur, and below BB shell cable guides (which undoubtedly are equally filthy).

Take the [now clean] right crank to a bike shop and ask whether they have the Helicoil kit to make a repair of the threads. If so, have them do it.

Bring the repaired crank home and re-install to the correct torque spec (in the neighborhood of 35-40 N-m).

Get a new set if pedals and inspect the thread direction on each BEFORE attempting an install. Carefully, grease and hand thread them, use a wrench to bring them to tightness.

Pause and consider the lessons you've learned from this. Remember the lessons.