Best free AI humanizer for thesis writing? Looking for something without tiny limits

I’m finishing up my thesis soon, and somehow editing the final draft is taking way longer than I expected 😭

Some sections are already written, but they still feel too stiff or overly structured. I’ve been looking for a decent AI humanizer that can improve the flow without completely changing the meaning, especially for academic writing.

The problem is that almost everything I find either:

• gives you a ridiculously small word limit
• rewrites academic terms that shouldn’t be changed
• makes the writing sound even more awkward
• or lets you use it once before hitting you with a paywall 💀

I’m not expecting something magical. I just want a tool that can handle longer sections, keep the original meaning, and make the writing feel more natural.

Has anyone found something that actually works well for thesis or academic writing without a super restrictive trial?

Would appreciate any recommendations or workflows you guys are using.