I am an International SEO Consultant -service that I provide with my company Orainti-, a blogger (Search Engine Land, State of Digital and Moz), speaker (with more than 60 conferences in 15 countries in English and Spanish in events like MozCon, SearchLove, Pubcon, SMX, SES, BrightonSEO, The Marketing Festival, etc.) & entrepreneur (providing free SEO related tools to the community as well as developing my own projects). I also give classes at various SEO & online marketing courses & masters (KSchool, Pompeu Fabra University, InternetAcademi, etc.) I have more than 8 years of experience doing Search Engine Optimization processes for European, American and Latin-American companies, helping them grow their organic search visibility, relevant search traffic & conversions in complex environments. I am specialized in organic search, and focused on international, multilingual & multi-country environments; as well as technical and multi-device type of projects; helping medium-to large companies; from e-commerce to startups. I have been included in Forbes as one of the 10 Digital Marketing specialists to follow in 2015 & in Business Insider as one of the 50 Online Marketing Influencers to Watch in 2016. With more than 33K followers in Twitter I like to share SEO & online marketing tips, news & resources, you can follow me at @aleyda or in my newsletter: aleydaseotips.com.
The best way is that you validate the search volume for the relevant queries in the different languages that you're considering to enable a new version for. By doing a keyword research you'll identify how many people search for your services / products / topics in Spanish from Spain or in English from the US and if it compensate to enable a new version to target them specifically. I have shared the process to follow here: https://blog.kissmetrics.com/how-to-international-seo/.