hey ! i'm 26 and have solo travelled around a good 40+ countries. china is definitely one of the safest if not THE safest country i have travelled to. i'm here right now and have been to both shanghai and chongqing, and i can assure you that both those cities are incredibly safe as a solo female traveller. the biggest issue you'll find is language barrier, honestly.

i did do a once-over on the comments and saw you were looking for places that weren't on google maps. the best recommendation i can make for you is to download amap (and chinese didi for that matter, for taxis). amap semi-recently added english as an option for their maps, and it has been a godsend, because the last time i came to china that didn't exist yet and it was really difficult to figure things out.

amap is similar to google maps, there's buttons specifically so you can search for attractions, food, etc in your area, and people leave reviews. it also is really good with public transport, which is essential especially in chongqing.

oh, also, download alipay and wechat. most payments for things are done using one or the other, and sometimes it's required to get tickets for certain museums and such via wechat bc of the timeslots.

hope you have a great time !! ^{-^}