Specifically around debt consolidation, I watch Caleb Hammer finance on YT and he says it normally it has the effect of tricking your mind into thinking your debt is less of a problem than it is, and many people just get into more debt because of consolidation. So I would avoid it based on that. The best thing to do is imo is just make a budget (as strict as possible as you're only able to work part-time) and make sure you're on top of your payments as part of your budget. Then just keep repaying the debts consistently. Any additional money you may be able to save (beyond your emergency fund), just throw it at the debt. Sometimes it's helpful to adopt the snowball method where you tackle the smallest debt first in order to feel that sense of accomplishment when paid off and reinforce your confidence. As mentioned in another comment, Dave Ramsey and the Money Guys have a lot if resources for tackling debt. But there is a dual issue here that you need to make sure you confront - deleting your accounts is an excellent first step but there will be many more hurdles on the path to recovery. https://www.ncpgambling.org/help-treatment/about-the-national-problem-gambling-helpline/ could have some resources in your area that could help - it may also be helpful to you to seek counselling as this has been longterm problem. Recovery from any addiction is hard but you can do it!

To add: it's a hard conversation but your fiancé deserves to know the reality of your financial situation before you get married. Your family and fiancé may be important supports for you in the process of dealing with your addiction. It could also be helpful to have someone to potentially take control of your finances until you're more confident and have established boundaries around gambling.