I saw advice once ((I'm sure it's somewhere in my writing advice or writing tips tags, but this was years ago)) that instead of emulating Tolkien and pouring linguistics into your writing (unless, of course, you're also a linguist) you should pour the thing YOU love into your writing
are you a fashion nerd? write about their dress, the fabric, the style, let that be the part you flesh out and out and out - what fabric do the elves wear? how many layers? (are they even elves?)
are you a bug nerd? make a fantasy species that's bugs. that's based on bugs. same goes for any kind of animal. elves are OUT, my species based on bearded dragons (lizards) is IN.
tangentially this is probably an aspect of why Homestuck was so popular. WOW, did Andrew Hussie care about their funny bug-like Troll species. WOW, was the worldbuilding for troll castes and stages of life like. Tolkien level of detail. Also!! Homestuck is full of Hussie's love for WEIRD VIDEO GAME MENUS and COMPLICATED MECHANICS.
so pick whatever you're a nerd about and fill your work with that. you don't need a fantasy language. but maybe you want to talk about the anatomy of dragons. maybe you're a nerd about Cambrian period organisms and life. maybe you're a nerd about book binding. or about music and how music can be magic!
hell, Witch Hat Atelier - whose anime just started airing - exists because people pointed out to Shirahama that art & draftmanship are basically real-life magic*. and WHA is a series about magic through drawings and ink! And how the best magic is precise and careful applications of the magic ink!!!
(*source - but be sure to read the whole thread!)
so... you don't have to be Tolkien. Be your own freak. And put your own nerdery into your work.