1. Get professional opinion - Doctor . always.

2. Physio / rehab

3. Massage

4. Stop weight bearing activities (running) for a while. Focus on non weight bearing such as cycling and swimming .

5. Go to the gym to strengthen your muscles .

Anything just ask. Me an ACL survivor. Not operate. But managing .

maybe your running form is incorrect causing knee pain

Can , but it doesn’t interest me. I use a roadbike to cycle outside.

Those fixed cycling machines are bad for your knees because of the static position.

If actual bike, you can compensate with body position

TS, this. Good advice esp cycling and swimming for recovery till your pain is gone. If you want slow run, run on grass padang as the platform is soft

Do more lower body weight training to kuatkan otot kaki. Long term benefits u will gain too

1. I have 100% been where you were. You can go acupuncture, chiro, use muscle relaxant, massage etc and it will still nag you. But I'm back on my feet and hitting half marathons on a weekly basis now. The 'cure'? thanks to Covid lockdowns - 1 YEAR absolutely no running at all - then 1 fine day decided to resume running, viola! The nagging knee pain is gone - so yes, REST THOSE KNEES! But no single human is the same, what took me a year+ could be lesser or more for you.

2. You can do the One Punch Man routine, minus the 10KM runs. 100x sit-ups, push-ups and squats. <- I did that, got the V-line in under 3 months. The problem (for me) is not the quantity/reps, is the discipline to do it everyday. First month build up from 10x (serious ah, when you gemuk and just started, 10x already very sakit) to 30x to 50x, second month push to 100x. Fell off the wagon after 2 bouts of influenza, can't find the ooomph to kickstart again (malas le tu)  but 100% can be done at home, or the park, gym too if that's your thing.

anyhoo, keyword to fix your knee - REST - DON'T STRESS it 

What running shoe are you wearing? Serious

Curcumin supplement - try longvida version

Steponlego
have you injured that side of your leg before, like since childhood, and then it healed? including falling on stairs and landing on that side of your pelvic bone or backside?

heel strike isn't a bad thing, I heel strike sometimes, on purpose, but that's with a decent pair of cushioning shoes
good luck

You should stop running for a few weeks first. I used to have pain in my knees as well. See doctor he asked me what my daily activities like.

The moment I said running he immediately ask me to stop first and observe. Our knees not design to absorb repeated shock from the tarmac.

And to my suprised my pain really go away and I don't waste hours running like crazy lol (21km runner before).