Want to go back home to Wales

Im a single mother who is a british citizen with 2 kids living in miri sarawak east malaysia, i came when i was 3 years old with my late mother(she was married n divorced to a local chinese man)in 1985 and have been here ever since but since my mother passed away a few years ago my live has got really bad that we struggle with financials.i was hoping if anyone is willing to help me and my kids get back to my family in Wales united kingdom...i have my dad n brother there.. The immigration  ask us to leave the country by june or july 2019 as i cant work and no way to save money to go home...