My 30 year old Dwarf Meyer Lemon tree is growing in the ground.
This year it contains at least 10 dark green golf ball size lemons that
refuse to turn yellow, remain dark green and rock hard. These tiny
lemons appeared early summer, and very slowly became golf ball size.
Trouble is, that these lemons remain same size. Only two show a tiny
yellowing section (10%) and are still dark green and hard as a rock.

The leaves also do not look green and healthy as they have in the past.
Now leaves are not bright green, but green with many alternating yellow
spots from tip and along edges to the back.

I may have not deep watered often enough, roughly did water every three
weeks. Have been infrequently feeding with Scotts Citrus food.

Want to help this tree ripen those ten stagnated lemons.

Question is what can I do to revive this Meyer Lemon?

Another 24 hour deep watering?

Apply commercial Citrus dry plant food?

Apply 0-10-10 to stimulate fruiting?

Apply steer manure?

Sure need some suggestions. I can supply pictures if needed.
Thank you, Dave_s