Hello and welcome!
The most of the producers under here, have rums that are rather sweet in most of their products:
•Zacapa
•Diplomatico
•Cartavio
To name a few
Hi, I could tell you to taste : RX1 : plantation XO Barbade rum sweetened RX17278 Sealander : a rum with taste… and sweet. Uncommon blend for a sweet one. RX244 & friends (RX135, RX1595) which are all good sweetened rums from south america.
Picking this thread back up because the question keeps coming in: we put together a sweet rum overview with community ratings and notes on how sweetening works. Most bottles recommended above are in there, worth a browse before your next pick.