Don't try HDD mining, everyone I know swears it's the worst thing they did in mining, also burst coin mining sucks the most. I don't know what's happening in your house but in my house GPU mining is profitable, I mine with Nvidia gtx 1070, 1070ti and 1080ti, ROIed 1/5 in one week, last year, so finally it was a good investment for me.
Btw don't get so stressed, do you still profit some cents or not? If not then how much you lose in month? Because possibly it can give you almost free winter, then I would sell them.
burstcoin mining (while I think its super cool / interesting) has been such a time consuming fruitless ($) endeavor . . lol