Help, translations, or advice to find a relative using chinese social media. Hi everyone,

So, I have Weibo and although I'm not great at navigating it, I'm hoping to use it to find my father, whose name is Liu Guoguan.

Unfortunately, my chinese is poor as I was never raised speaking it or taught it, even though I'm half chinese. The information I have is quite vague, but I hope what I do have will help, including some photos that I'm planning to hopefully post on Weibo.

The Story:

Around 5 or so years ago my dad returned to China without a word, I don't even know where, but supposedly his home in Fuzhou. Being only 10ish, I was very sad and angry, especially as I knew it was likely I wouldn't get to see him for a very long time. So, I refused the calls he made to my mum asking for me that year. The calls got less frequent and eventually stopped at some point following year. However, now i am 16, i realise that you should cherish the time you have with the people who are most important to you.

May of this this year, I managed to message his old friend, whom I knew when I was small, that he said to contact him through. I asked for my dad's number and recieved new that he had heard from his mum living in China...
He said that 2/3 years ago he heard that my dad was at work and their was a car accident in which he died. However, he has no information supporting this and isn't certain, also bearing in mind his English is poor.Only now, with my first Christmas knowing it is possible that I no longer have a dad, am i determined to find the truth- otherwise I don't think I can ever move on...

The information that I gained:
Name: Liu Guoguan
Last known address/area: Fuzhou, Changle
Supposedly passed away around September 2015/2014

I'm really sorry you had to read this essay and that it's irrelevant to the purpose of this site. Thank you so so much! Questions are welcome.