I would not recommend advancing to University if you get around 50-60 ATAR (Even lower), unless you're really serious about it and got the passion for it. University is much more rigorous and will be more painful than the HSC.
But leaving that aside, you can get into some basic UWS courses such as Diplomas or Foundation Studies with around the 50's to 60's ATAR range, as you can receive up 15 bonus points (Area bonus point and also Subject if you receive band 5-6).
You can also try many universities which offer fabulous courses at lower ATAR points such as Notre Dame, Australian Catholic University, University of new England and different Foundation Studies courses where you would eventually move into a bachelor degree at many universities. For example, Macq uni has a program called SIBT which requires around 67-68 ATAR and allows a student to advance to Second year bachelor courses such as Commerce and Arts if they get the sufficient GPA. Universities know that the HSC is not as important and are always offering many entry pathways and also second chances. But yeah I would highly recommend the SIBT program.
I know some schools such as ICMS which offer fabulous business, accounting, hospital and tourism degrees with no ATAR requirement.