From what I understand, it takes two to forgive. One to do the forgiving, and one to do what is necessary for the forgiver to forgive. Repentance is what is necessary to be forgiven. As Jesus said:
“If your brother sins, rebuke him, and if he repents, forgive him. If he sins against you seven times in a day, and seven times comes back to you and says, ‘I repent,’ forgive him.”
(Luke 17:3-4)
In other words, if someone wants your forgiveness, they should repent. If you want someone to forgive you, you should repent. But you don’t have to try to repent once, and then give up if you fail. You keep trying, and keep repenting, and the forgiver keeps forgiving. It’s a process, rather than a one-time event. The Lord would have us keep forgiving those who keep trying, and have us keep trying so that others might keep forgiving us. That’s how we forgive others, and (it seems to me) that’s how the Lord forgives us. That’s why we should repent–so that we are able to forgive one another.
Bowing down before the Lord is something we might literally do one day when we see Him face-to-face. Bowing down before him now is something we figuratively can do every day. When people say we bow before the Lord, what they are doing is using the word bow as a figure of speech for worshiping and obeying. To bow down is to worship (through prayer, the Sacraments, etc.) and obey (by doing what the Lord and the Church reveals to you that you should do).
Hope that answers your questions, but let me know if you have follow-up questions.