"One's immense contribution" refers to the significant and valuable impact or input that someone has made in a particular area or field. It implies that their contribution is substantial and has made a noteworthy difference. Full definition
And consequently the whole immense contribution of mythologies and of mysticisms no longer appears as the residue of a prelogical mentality, but as the expression of a permanent structure of religious knowledge and understanding. (religion-online.org)
Aregbesola further described Comrade Sunmonu as a never - say - die unionist whose immense contributions towards the socio - political and economic emancipation has aided the democratic structure in Nigeria can never be hastenly forgotten. (nigeriapoliticsonline.com)
The time is indeed right for AW to hand over the reins but it is difficult to overestimate how immense his contribution to the club has been over 22 years. (goonerholic.com)