少少意見, 請不要見怪.... (sorry for my 半中半英 reply)
1. 樓主人到中年, 上年初回流返來 => 你走了, 公司不會可惜的, 請新人很易...
2. 如果離職, 想做什麼? Marketing?
3. 二個月前到最近send過幾份求職信,只得二份有回音... do you know why?
* 上年初回流返來, 在職不足 2 years, some 顧主 may think you are not stable enough
* Your CV don't have outstanding content and experience... if I am a 顧主, why don't I employ a person younger, if experience /salary is almost the same?
My recommendations:
1. Now, 你唔係好多籌碼同人討價還價...
2. 唔覺得會有機會升 => get enough experience first before finding a new job.
3. If you think 有野學, let's focus on Sourching & marketing! Get enough working experience, make your CV looks better, and give confidence to your future 顧主.
Good Luck!