I imagine something like Esperanto would be much more suitable for the role.
Meanwhile you can learn English from watching Star Trek, Time Team, SpongeBob, reading Harry Potter, The Hobbit, shitposting on Reddit, etc.
For better or worse, English already is the de-facto universal language, or the closest we have to it. We tried the Esperanto thing back in the 20s, and it didn't really work out as there was very little interest outside of a fairly sizeable but ultimately limited group of enthusiasts. I don't see how Esperanto or any other constructed language will take off in the foreseeable future.
Continued evolution of English pronunciation and spelling seems like a more realistic and better option – the language will change anyway, as all languages do, so might as well ensure it changes in a reasonable direction. Time spent advocating Esperanto is probably better spent on advocating more consistent English.
This is unlike, say, German, where each word has a random gender and you need to learn it along with the word. There, I agree, that's unnecessary overhead.
Also, if you don't know Spanish, I'm not going to teach it to you.
It's true it goes back to 1300, but it had also fallen out off fashion and was considered "wrong" later on. Languages change, and don't do so in a linear straight-forward way. From our perspective, it's very much a neologism (although it's been a few decades, and arguably already passed the neologism stage).
But it's interesting to speculate on what English does which could be considered pointless: * Gendered pronouns (he/she/it) - some languages e.g. Persian/Farsi do with a single pronoun for both. * Number agreement for 3rd person verbs - i.e. he goes but they go. * The continuous aspect. In many languages the expressions 'I run' and 'I am running' are identical. * Articles. 'A cat sat on the mat.' Many languages do without these words and rely on context. * Required tense marking. 'I speak', 'I will speak', 'I have spoken'. Some languages make the distinction optional - i.e. 'I speak' can mean 'Today I speak', 'Tomorrow I speak', 'Yesterday I speak'.
Or things which could be useful to introduce to English: * Animate/Inanimate pronouns - i.e. a formal distinction between 'it' (used for objects) and singular-'they' (used for humans and similar). * An actual second-person plural - like y'all, yous, etc. rather than 'You' functioning as both singular and plural. * A distinction between we (including the person to whom you are speaking) and we (excluding that person). 'We are going to the zoo tomorrow' - does that mean me and you, or me and my family? * A grammatically distinct future form - 'I walk' -> 'I have walked' in the past tense, changing walk to walked, but 'I will walk' in the future using the same form as the present.
Isn't that the same for many things [how something is vs learning something about it that isn't how it is]? Roman numerals still catch me out; I cannot work out some programming code; a highlighted corner in a spreadsheet hides a comment; I can speak German phonetically (easy pronunciation rules - wysiwys) without understanding a word understanding a word.
1. There are different pronouns ("li" and "ŝi") for male and female persons, just like in English. There is a also a non-traditional gender-neutral pronoun ("ri") that a large proportion of Esperanto speakers have probably heard of by now but is not yet used very much.
2. There are about 20 word pairs where the female form is derived from the male form with the suffix -in, for example, "patro" father, "patrino" mother, so the sexes are treated asymmetrically. There are multiple proposals to fix this but, as you can imagine, it takes a while to reach a consensus on which proposal to adopt, if any.
Both of the above make it difficult to talk about someone in traditional Esperanto without knowing or revealing their sex, and also make it difficult to talk about non-binary people. But in principle the problem is not hard to fix and so it probably will get fixed once enough people feel strongly enough about it.