For better ease of typing, english 1k or 5k [Monkeytype] ?

I already type with punctuation and slowly but surely learning how to touch type numbers, my goal other than having fun typing, is to make typing in english and later in french easier, with practice. I can already type comfortably as I spend 10 hours a day on my computer but I want to reach the next level.

I currently practice on english 1k but am wondering if switching to english 5k would help me more as it has overall more words so more % of the written english language to practise.

I am french so when I'll be the goat in english I'll switch over to french.

My PB is 106wpm 99.32% acc and I only do 25 words as it's my favourite setting to practice on : 'if there's no fun, there's no reason to continue'.

So I'm wondering if on the long run, it's better to do 1k or 5k english.

Thank you in advance for your insights.