Tattoo ideas?

I have CFS/ME/SEID and I've always wanted a tattoo at some point. I'm 19 and I've had my illness for 3 years now and once I'm done with my uni exams I'm having a year off to focus on my health and plan on fully recovering (I've already recovered a lot just being at university is slowing me down right now).

I don't plan on getting a tattoo until I'm fully recovered because one of the side effects of my condition is an auto immune skin reaction thing that's horrible and I don't want to risk it flaring up as henna tattoos already trigger it mildly.

However I do want one to remind me of this point in my life because even though this illness is the worst thing I've ever been through and I wouldn't wish it on anyone, I've grown so much as a person because of it and it's changed my perspective for the better. I appreciate everything so much more and I never want to forget any of it.

I've got at least a year before I'll be getting one (probably a couple of years to make sure I'm 110% better) but I'm looking for ideas for an inspiring tattoo? Whether you have one yourself or you just have an idea? I'll appreciate any responses so please do share :) I'm just looking for ideas right now and would obviously work on any designs for months before doing it.

My only requirements are-

-Size and location suitable to cover up if required (although I have thought about my wrist where I could wear a watch because I'd always see it and always have that reminder).

-Simple (I don't think I'd suit a complex tattoo)

-Ambiguous meaning (I don't want people to see it and know exactly what it's for)

Thank you :)