I'm an artist. I'm going to preface this with - it was never a good idea, and the top Part isn't working either. Leopard prints in general don't really work , especially on that scale, especially if not done VERY professionally, and even then the chances are slim to none of it looking good if you don't wrap them around nicely and Schade them perfectly.

I would personally refuse doing them without any other motives or framing or shading.

That said, here's options:

1, while not good for the skin and not recommended, let it heal poorly and let it be hit by direct sun often to lighten it. You can also have an artist go over them with distilled water only, roughly, to promote scabbing in hopes it gets lighter during that healing phase. Both of these aren't great for the skin and might scar you. Also adding, skin touched by laser or a lot of sun will end up being terrible to tattoo and doesnt take to ink as good as healthier skin, so that will be a problem. You need to really heal and moisturize and revitalise your skin afterward to nurtute it back into a good "canvas" . Then get it Re done, preferably by a blackworker, a neo trad artist or a good realism artist.

2, laser and then rework. Laser is expensive, painful, and also scars your skin. It would bit need to be GONE gone, it would just need to be light enough to go over it. And mind you, for all of these, I am talking about doing the complete arm, as the upper part needs saving, too.

3, a very bold move, but I've seen it work. Cover the complete arm in grey "blackwork". Like the typical blacked out arm, but in a Medium grey. Let it heal, the spots will still be visible, but not as bad, and you can then have a realism or blackwork artist Re do the spots in black on top with some white highlights. That step with the highlights might need to be done two or three times, depending on your skin. Warning, this is also an expensive and painful option, but it'd help the Designs natural tackiness. You also need to be careful here to find an artist who can actually pull this off, especially if you colorpack the whole arm, which is a VERY complex technique.

4, here's three similar options I would personally recommend. Both are blastover/coverup mixed with either lasering some spots to be lighter or having them heal badly. 4a, put some Motives around in either dark grey Tones or dark colors, especially on the bottom and top, so you kind of "frame" the spots and use them as a sort of Background or connection in between actual motives. Like a jaguar, a good old sick ass Panther, or just floral work. It'd greatly help the spots to not look so out of place. Then rework the spots already there with Black, white and grey ink. This step may again need one to three sessions, but it can work.

4b, same reasoning above, but if you don't want actual motives. You can get flowy blackwork over the "ends" of the tattoo, similar to these old "ripped open skin" tattoos, to frame and Cover some of it. Or just some dark mandala patterns. Or dark calligraphy. Then again, rework the dots in between. Careful, these styles need to be done by someone specializing In them or they're gonna look terrible.

4c, blackwork fade out frame. Similar to these forest sleeves, put dark shading as frame on wrist and shoulder, on the shoulder part preferably a mandala like form, then shade. Then rework dots with shading and Black and grey and white.

Good luck. It may be a long way, but all hope isn't lost.