i put mine on a raised bed, but amended the soil
(lots of home-made compost + coffee grounds etc...)
and keep adding leaves, clippings etc...
it gets a ton load of mulch , green and browns.
and if it goes 5 or 6 days i water it.
when i got it, it seemed root-bound
and i noticed all the roots were surface - fine roots.
so i knew it would dry out easily and mulched very heavy.
also, i had given it some iron and epsom salts
and have a couple of nitrogen fixers underneath.
after giving it the iron/epsom it sprouted new growth and the leaves got dark green.
its growing fast, and looks healthy (fingers crossed)
I had one that was somewhere around 15 feet tall with a trunk bigger than my thigh (20+ years old). It flowered, but it never really produced (I ended up with perhaps 1/2 dozen fruit in a good year). And it suffered from random die back. I tore it out. My story was not unique in this area.
For me, eugenias (with the glaring exception of grumichama, which produces very well) haven''t been reliable producers. I think there is some nutrient lacking, perhaps including nitrogen? I haven't quite figured it out yet.
I also have a roughly 15 year old pitomba that stopped production (doesn't even flower anymore) about 4 or 5 years ago, despite growing quite well and despite previously producing fairly well.
I think the birds also raid the fruit.
https://gardenoracle.com/images/eugenia-involucrata.html
"Soil: Well drained, high organic matter, pH 5.6-6.8 (acidic to slightly acidic). This plant is intolerant of alkaline soil and only slightly salt tolerant. "
I assume that this doesn't describe you? Are you on limestone?