Rebuilding my credit need advice

Hello I need advice on where to start on rebuilding my credit since I was 17 I was kicked out of my house had no idea how credit worked and I ran it through the ground on apartments pay day loans credit cards etc but now I’m 27 and in a better position financially and will like to build my credit up when I checked my credit last month I was sitting at 389 score I have about 4 discharge accounts 5 revolving accounts at this point I can’t get accepted anywhere but I was thinking about trying a secured credit card with opensky anyone have any advice and what’s there experience with them? And what steps should I take on trying to repair my credit do I contact and ask for a pay to delete? Thanks in advance!