You can usually improve readability a bit, but not fully recover detail that was never captured. For a JPEG like this, the most useful edits are:

• adjust curves/levels to increase contrast and darken the text
• desaturate or convert to black and white so color doesn’t distract
• fine-tune brightness/contrast after that

This may make the page more legible, but JPEG compression artifacts and blur can destroy fine letter detail. Once that detail is lost, no filter can truly restore it.

If your goal is readable documents rather than photo editing, a document scanning app is often better. These apps can automatically straighten the page, enhance black-and-white contrast, and export a cleaner PDF.

For best results, improve the original capture:

• keep the page flat
• align the camera square to the page
• use even lighting from both sides at about 45° to reduce glare
• use low ISO to minimize noise
• avoid reflections, especially if shooting through glass

So: yes, try curves plus black-and-white conversion, but for this image the quality may simply be too low to recover all the text cleanly.