I have the same problem with shoppy.gg, BTC transaction is stuck for days and they don't respond anything
Op's next post after what you quoted was them affiriming everything has been solved. Idk if it was through shoppy's help or the mempool just eased up though. as you may have noticed, these two posts had a 10 day gap.
What about the suggestion/s mentioned before in this thread, have you tried them? particularly CFFP if you have the PK of the receiving address or viabtc if conditions are met.
Yes, the OPs cleared when the mempool got a bit less congested in early June
3 options now
1) Wait it out.
2) As @Potato Chips said do a CPFP if you can
3) Paid TX accelerator https://www.viabtc.com/tools/txaccelerator
Without knowing the amounts and your need for the BTC it's impossible to tell you what you should do.
-Dave