use a shower head and spray off all leaves trying to knock some of the bugs off, wipe down large leaves that you are able to.
Spray all of your plants with neem oil or horticulture oil. this will suffocate the bugs.
Spider mites eggs hatch every 3 days and the oil ONLY kills ones that are not in the sac, not larve. You are going to need to adopt a schedule for spraying your plants EVERY 3 days, for a couple of weeks. From then on, you will want to spray once a week just in case. do not celebrate too soon, these bugs will hide well and reoccur a bunch of times. I have first hand experience with them coming back even worse
There are options of adding beneficial mites, lady bugs and other bugs to your plants which would kill the predatory mites, but i have never done this for indoor plants. I do not think i would for an indoor plant either.
Horticultural oil is the best way to go. You can buy concentrate on amazon, dilute in a spray bottle and voila!
Monterey LG 6299 Horticultural Oil Concentrate Insecticide/Pesticide Treatment for Control of Insects, 32 oz https://www.amazon.com/dp/B001RPVUCY/ref=cm_sw_r_cp_api_glt_fabc_6MDTV0ZN8T43AEDK9B9S?_encoding=UTF8&psc=1
Those are fungus gnats. I purchased this to get rid of them and it worked well. I also purchased those sticky traps, but I only caught one the day after I sprayed. You can also put the plant outside, if tolerated, and let it dry out to remove the moisture; I did that for my rose bush. Make sure you remove dead leaves, as they fall to get rid of anything they like to eat.
Edit: grammar & spelling