If you don't want drugs then a hair transplant, wig, or scalp micro-pigmentation are the best ways to go.
1. Hair transplants could either improve your condition or give you a few new scars for your head so I would make sure to use a good surgeon and even then for a Norwood 6 to get good coverage you'd be spending more than what you'd pay for a nice used vehicle in costs.
2. Hair systems or wigs are pretty decent these days and a lot of actors use/used them and they work great unless you decide to do any strenuous activity or go swimming.
3. Scalp micro-pigmentation (google it) is a bit newer and is basically tattooing freshly buzzed hair follicles on your head, the results look VERY natural and if you can pull off a buzzcut rather well then this is a great choice but you have to buzz it twice a week for it to look correct. Also it requires a bit of upkeep as you'll have to go in and get a touch-up every 3 years or it will fade slowly until it disappears. The cost for this is around $3000-$4000 and a few hundred for touch-ups.
There are probably other things but those are your best choices, My dads friend got a hair transplant 7-8 years ago and it turned out bad so he wasted $4000 on it and has a scar to show for it so I may be biased against them.
My recommendations would either number 3 or Finasteride because the other options have lower chances of working.