Another request due advice

Hi I'm currently on save, have not received an email due the change in July 1 and am thinking of switching to paye idr or ibr. Not sure if I should switch now or which one to switch too.

I make about 73000 gross per year but 12000 in alimony and owning a home pushes my agi down to about 56000 per year last year.

Other factors to consider are my partner no longer works so I am making a 4600 per month house payment on my own for at least this year so I don't know if my agi or discretionary income will go down even further since I think i will be able to claim her as a dependent and will be making the majority of the house payment and have even less discretionary income.

We are not married. I will be renting a room in my house for about 1500 at sine point so that will affect my income as well but it will all be going into covering the mortgage. I have around 200000 in student loans beginning in 2004. I doubt I will ever pay these in full and will have to get forgiveness. I am 50 now so I will be in retirement age by the time the loans and house are paid off. What are my options and likely current payments if I switch to paye or one of the other options? The loan calculator doesn't let me include ask the whenever that affect my agi only what I make over all. I am on nelnet and plan on calling then but I am not sure how much advice they can actually give. Thanks in advance for any suggestions