OP I have been exactly in your shoes & made the same mistakes.
First I would go on a 100% purchase pause with the exception of the basics, bare bones, rice & beans staple food etc.
Second draw up a budget, list your bills out every single one, including any luxuries such as memberships, subscriptions, etc. Cut out all non essentials, I mean everything.
Third keep a spend journal like every single penny that comes in and out of your hand. Seriously you will see where money leaks out of you.
Fourth, if you do 1, 2, 3 that will build momentum and make you feel good.
Fifth, search and find every single shiny thing you can sell to go towards your debt.
Sixth start an emergency fund even if it is a fancy pants decorated empty peanut butter jar (so you cannot see the money). I did this. Keep it there.
I would definitely look at selling the bike back to the dealer if, as you said, the season for selling bikes is turning against you.
That payment, insurance, upkeep, storage is just going to mentally wear you down. Explain your situation to them.
Maybe they will work with the difference you owe them or do it on consignment.
Search and find any shiny thing you can sell that is just taking up empty space. You might own a gold mine of shiny things that you can flip for cash.
Any cash goes towards your debt snowball. A second job or side work or even finding free stuff at the dump makes money. I did it. You can too.
Honestly, it all starts with one step to change an attitude, one day at a time. Each day adds up to more days, less debt, more motivation to get free of spending.
Following this formula, it works. In the last 18 months, my hair was on fire in debt from years of emotional spending and not making good financial decisions.
You gotta figure out the why of your spending too. It is mindset that made someone like me a prison to stuff and debt.
As of today I no longer have cc debt. My car loan is almost done. My house is almost paid off. My job didn't change and I didn't die just eating rice & beans & writing stuff down in a notebook.
It is empowering and there is real freedom if you are willing to do the work. Guaranteed.
Good luck.