It's a lifetime subscription. Your membership from Steem is still in effect (and in fact you received some Hive SBI from it also). Both have been steadily building up some pending upvote balance while you were gone- which is why you started getting some chunky upvotes as soon as you started posting again, but they are dropping in size as you use up more of your pending upvote balance.
If you will be posting on Hive but not on Steem, you can consolidate everything into Hive SBI also.
For the $150-200 a month question, I think I need a little clarity about what you're asking and looking for. If you're on Discord that's the easiest way to reach me. https://discord.gg/aCmMKR5W
Alternately I can send you an email, but I think a quick conversation in Discord may be the best bet here.