I had this problem last year. I had to wait, I don't know, 3-4 months before they were dropped by the network. It's been that long for you so I don't know what the issue is. I'd say just keep waiting, at some point they'll drop presumably.
I also had like 3 month or so in 2016-2017 when bitcoin reach new ath many transaction will fill up fast the block and never get confirmed
i dont know as far that i rember there is actually an Transaction Accelerator
https://www.viabtc.com/tools/txaccelerator you can try it the btc.com also have one too