u/Hopeful_Branch_2987

Hey y‘all! I am playing Origins for a few days now and my Main dps is Meliodas I am currently lvl 28 with nearly 4k power on him. I am at the last boss in the Prison on Top. How do I get stronger? What are ur helpful tips for me to do and are there such things as strong secret weapons or stuff? I feel a little bit lost and get the feeling that I need to pay to get better. Only did Story qs and a few bosses / dungeons. Please help me out