My question involves criminal law for the state of: WA

I have a unique problem. Many years ago I was convicted of Arson 1, did time, and was sentenced to over $100,000 of restitution for a house that burned down. I don't know if the victim was reimbursed by insured or what, but I am ordered to pay $25 a month and have been doing so for about 8 years now. I am worried what can or will happen in the future since I really can't pay back that much money. Any advice would be greatly appreciated as I have no idea how this works. For now, I am paying my $25 a month.