lonesome strawberry

Without seeing your plant I'm making an educated guess here.  I'd say with a 50/50 ratio of poo to soil that your strawberry plant put all its energy into making foilage instead of fruit!  "more is better" is not necessarily true with fertilizer.  Strawberries are prolific but you'd still need several more plants to give you a decent amount to chow down on during the warmer months.  Light snacking?  1-2 plants per person.  Want to freeze some for smoothies later?  2-4 plants per person.  Into making delicious jams and jellies?  Plant as many as you dare.

Your plants will put out runners to form new plants but it will usually be at the sacrifice of fruit production  (depends a little on the cultivar).  I'd advise getting 'day neutral' (not 'ever bearing'...there IS a difference between the two) plants for a good steady supply of berries.  Treat them like a typical perrenial plant (they'll be in that spot for up to 4-5 years) and give light shots of fertilizer in the spring and mid-summer.  Don't whack them back like June-bearing strawberry plants in the fall time.  Mulch'em with straw or whatever if your winters are freezing and clean up dead leaves in the spring so new growth can get a good start.    Hope you don't give up the fight!  Fresh picked strawberries...juicy and still warm from the sun...are so good you'll knock your sweet old granny down to beat her to 'em!