I am so happy for you getting you Brown belt, I presume this is your 1st Kyu grade, May I say don't see it as nearing the end, see it as nearing the start.
Too many Brown belts stay at this grade and never go to Shodan or they leave before ever getting near it. I can tell by you message you are someone like myself who sees the journey infront of you.
Karate is like hot water. If you do not give heat constantly it will again become cold.