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It starts low for everyone. It slowly grows from rewards from commenting and posting. You can also increase it with real money.

commenting make it even lower, i dont understand why

do you mean bandwidth?

yes and voting power also

When you vote, you lose 2% of voting power. You gain 1% every 1 hour.

When you comment, others reply to you, you upvote, or others upvote you, you lose 2% bandwidth. You gain 1% every one minute.

So if you spam comments or get lots of likes at once, you drop below zero and you can't use your account for awhile.

hmmm but i was offline on the day time then i come back its still less