You need to first accept that you are voiding the warranty.

Very likely candidates for you are Rock Shox Paragon and Suntour N__ models. Other than those you are likely getting into money to replace some other parts to match.

Make sure that the following match.

• Since you are buying a used fork, the steerer will be cut to length. It needs to be as long as the steerer on your existing fork.
• The headset needs to match size. Some forks have straight 1-1/8" steerers and some have tapered steerers that are 1-1/2" on the bottom.
• The fork needs to be made for your wheel size. Your bike is for 700c commuter/trekking/touring wheels (sometimes called 28") but would also tolerate a fork for 27.5" mountain bikes.
• The dropouts need to match your wheel hub. Most forks have 15mm thru axles, and are now mostly 110 mm wide. Older or cheaper ones will have 9mm quick release and 100mm wide.
• The fork needs to match your brake style. Most forks now are for post-mount disc brakes. Older ones may have IS disk mounts and/or posts further up for rim brakes.
• If some of these don't match you can change the brakes, or the wheel, or so on.