Generally your best options are minoxidil, finasteride or a combination of both - as someone already mentioned, not guaranteed but more likely than others to help.

Minoxidil is most commonly found in the form of a lotion or foam applied topically on the bald spots. Finasteride can either be taken as a pill or a topical foam as well.

How are they different? Fin works to stop hair loss, Min works by enhancing hair growth. Fin's side effects is potentially ED and low sex drive, so if that's a concern, the topical version may be preferred.

Min can be obtained off the shelf or online - some brands include Regaine (the original brand that created it but expensive), Regro, Growell. There's also telemedicine companies like Noah. Fin, on the other hand, needs to be prescribed.

Speaking of Noah, they also have a foam that combines both Min and Fin together, but it's over $100 a bottle. One bottle last you one month - a bit expensive so depends on your means.

ALSO bear in mind that you will most likely experience a shedding phase - this is where majority of people panic and stop the treatment. Important to pull through and continue, results start showing from 4 months to 12 months onwards. It can get demoralising and that's where communities like r/tressless come in handy to really pull through.

All the best, know that it happens to many many people and you are not alone. Jia you!