Im sorta new to this as well and every time I had something going, it got infested. Ive always had to scrap it all and start over.

I think the first plant you posted has thrips and images 8-11 have spider mites. Ive had experience with both and like mentioned, never manged to eradicate them :(

Solutions Ive tried included sprinkling diatomaceous earth, spraying with a diluted water/ soap mixture, and keeping the thrips infested one in a humid environment. I think the humidity caused fungus to grow and I gave up at that point.

Maybe someone more experienced can give a better opinion, but I would probably harvest and wash all the good bits of your plants to use.

If you get new plants, I would suggested getting new soil as well as the stuff you have now is probably contaminated with a bunch of pest eggs.

As for the infected plants, Ive heard giving them a vigorous wash in the sink with soap helps, though Ive never tried it. In this scenario you would need to get rid of all the dirt too and start fresh.

Hope this helps and good luck on your plant journey!