I would start looking for a job sooner rather than later, unfortunately there is a massive shortage of jobs for the amount of applicants! If you have hospitality experience then agency work is very useful.
I took a gap year and so have quite a nice chunk of savings to fall back on from full time work as I didn’t travel.
Bristol is very expensive and unfortunately it doesn’t get any cheaper when you move out (my rent next year is 10.5k and I also get min maintenance lmao).
If you have any kind of disability or health condition use it to your advantage, I got 20% off my accom fees last year as it was near the hospital and I got letters from my specialists saying that is beneficial to me. I would defo have this convo with your parents about money and have a frank discussion on how much they can and can’t help you (honestly everything helps even if it’s just £20 that’s your weekly food shop sorted!) and then go from there x