you are probably inactive, hbsag value has no meaning unless it is in iu/ml unit, just monitor hbvdna pcr and alt/ast every 6 months.if you have a fibroscan available check fibrosis
also make ultrasound for liver cancer every 6 months
hbv is not dangerous at all until inactive and fibrosis low, you just have to monitor that fibrosis stay low so you don t develop cirrhosis or liver cancer
your family has probably been infected by you if they had no vaccine but they all cleared infection so they are immune now
What kind of risks do I have and how to minimize them?
--7200 and >3000 may not have qualitative difference.
And how often should I get checked?
--Depends on your treatment route.