Yes, from these results, it would appear that you have cleared the infection. Congratulations!
It is rare, but yes you can have a reactivation of the infection. This is of particular risk if you become immunocompromised (e.g. if you have a transplant and you need to be on immunosuppressants). This can be managed through prophylactic antiviral treatment.
Reactivation of HBV in the absence of immunosuppression in people with decent anti-HBs titers is so extremely rare that I’ve never seen any numbers assigned to it.
If I remember correctly from info I was given many years ago, HBV will spontaneously clear in a few percent of chronically infected people every year. The number I remember is about 4%, but that seems high to me so perhaps the data I’m remembering are out of date.
I agree with @john.tavis here that it is extremely rare in normal cases and you would not need ongoing monitoring of your HBsAg. It only should be kept in mind in the rare case that you are undergoing immunosuppressive therapy or having long-term steroid use.
I strongly believe in science and in medical treatments…but I am equally sure that the cure is also in natural things (aliments,herbals,state of mind).
Can you tell us if you consumed any specific aliment daily?..or did you had any specific routine?..maybe meditation?
Maybe the cure consists in a connection between our mind and our body and maybe you have a tips or trick that will help your rare case become frequent.