The phrase 'enormously decrease' is correct and usable in written English.
You would typically use it in a sentence to indicate that something has decreased very significantly. For example: "Over the past few years, the number of people using public transport has enormously decreased."
This enormously decreases your chances of getting chosen than if you're staring at the teacher, looking into space or doing nothing.
Even racism against Brazilians has decreased enormously".
The half-life of nonsensical findings has decreased enormously, sometimes even to before the paper has officially been published".
For the CP-Spinach (after spinach cultivation in CP-treated soil) clone library clones of the Bacilli decreased enormously as compared with those in the CP library.
The northern herd has decreased enormously since the mid‑1990s; this has been attributed to wolf predation and causal effects such as elk using more forested regions to evade predation, consequently making it harder for researchers to accurately count them.
Verified biomarkers of effect require an understanding of metabolic trafficking and can be enormously useful for decreasing the cost of studies, for providing early answers, and for studying dose-response relationships.
With C2C towels you can enormously decrease the impact of cotton production on the environment.
Scanning electron microscopic photographs of artemether (ARTM) alone showed typical crystalline blocks of ARTM, while in group-1 SDs of ARTM, SEM showed that these crystalline structures of ARTM were decreased in size enormously having no sharp edges in both physical and freeze-dried mixtures of group-1.
The doping of noble metal, especially Pd, decreases the chlorine overvoltage enormously.
The APS-Au NPs as film on the electrode surface acted as nanoelectrode and facilitated the electron transfer process and decreased the oxidation potential enormously towards nitrite.
The substantial regional inequalities in public and private sector decreased for the private sector enormously while a little decrease was observed for the public sector.
