If you have done a bachelor's then your next study should be masters or a postgraduate diploma or something similar. If you want to pursue an undergraduate program, you need to prepare a strong letter of explanation highlighting why you want to do it and what your future plans are from it. Also, IELTS score of a minimum 6.5 in all bands is recommended.
They most likely will look at your previous refusals while evaluating your application but till the time you prove you are a genuine student who has the intention to study, prove you will go back home and has the funds, they might grant you an approval.