I’d suggest you consider engaging a consultant in your industry (not me) that is capable of working with you to develop a strategic guidance plan.
Although reaching for merger may be an option, it could end up being as fatal a move as not addressing the main issue; lack of sales.
Purpose of plan is to evaluate internal/external environment, assess risk, and determine appropriate objective strategy and tactics.
For example, growth strategy requires stability. In your case, retrenchment may be necessary to first stabilize business.
“A small shop built on the ground up.”
If business owns its premises, the owner may be willing to sell you the goodwill or cash business.
Here, boss retains property ownership and you pay what is referred to as NNN or triple net; monthly rent, liability insurance, and annual property tax.
He may also be willing to do seller financing. Here, you would make a down payment (i.e. 20 or 30 percent or more of market value) and he loans you the remaining amount and charges you interest on unpaid balance like a bank would.
Downside
“Most of the competitors are closed and retired.”
Reason for this is shoe cobblers is an industry that has been in decline for a long time.
This is due primarily to shoe design (solid heels, throwaway) and economics (China).