As I said earlier, just thinking that you’re good enough, doesn’t make you a great Spanish translator. You should have advanced-level proficiency in the Spanish language before considering a career as a Spanish Translator.
This means you should know everything about the language i.e. grammar, vocab, etc. You should be well-versed with Spanish not just contextually but verbally as well. Take up an online course in Spanish or attend Spanish classes locally if possible to hone your skills and connect with people learning the same language.
Before choosing this as a career, make sure you’re as fluent in Spanish as you claim to be. If the language is not part of your daily dialogue apart from your native language, then you can’t be a good Translator. So, to become a good Spanish translator, start by reading a lot of Spanish stuff, like news articles, books, comics, etc. Try to converse in Spanish and see if you’re able to listen and understand it accurately. Just keep advancing your knowledge in the language, by staying up to date with vocabs and other things.
The golden trick here is to keep reading a lot of stuff in Spanish and your native language as well, make reading a part of your daily routine and you’ll be on the road to becoming an amazing translator!