I am a tanker who’s unit doesn't currently have tanks.So my unit is encouraging me to attend a school. What schools should I consider?

Go to welding school.

Always planning for your future after the military is worth adding to the mix. Sure, what benefits you while serving is good, but fingers crossed after 20 years in, your life after that will be much longer than that. And anything to help keep that solid, something to be worth factoring in your choices.

Before I retired in 2021 they were allowing 19K and 19D to attend airborne school especially since they moved to Benning. Things change therefore I don't know the current climate so to speak. All I can say is I've known plenty of tankers and scout with jump wings. 5 jump chumps they used to say. Air assault perhaps also. Get promoted and I believe Master Gunner school (also Benning) was accepting E-5s. Not an easy course, especially depending on how much tank experience you have. You need to get promoted regardless. There's always Recruiting or Drill. If not any of that works then get a college degree then go Green to Gold or put in a Warrant Officer packet. Talk with your schools NCO.

What are your career objectives? Do you have any college now? Are there any MOS specific courses you can take?
Combat lifesaver course was fun and only a week long and worth promotion points.
How long have you been in ? How long before your window opens to reenlist ?

I don't know what they will let you do, but one thing your unit will have need of is people with medical training. I know that it isn't the direction most folks are discussing, but you can make a big difference for your unit and everybody loves "Doc"...
I am years away from the Army and was in a light armored infantry scout unit, so if this sounds like something you would consider, find someone who knows what they are talking about,. :)

Maybe try truck driver school, you have expercince as a tanker, and can make good money when you get out. Semper Fi

In my day in alot of medical units they had what they called "FastMOS" programs, which, with the support of my chain of command I was able to gain TONS of additional training, MOS's and experience that helped me in many other areas of my career(s). Maybe there's still some programs like that you could participate in.

Welding

So you’re a tanker without a tank, you can’t jump, and totally a LEGG. You might try Food Services, Kitchen Utility Repair Services, or Toiletry Development and Maintenance Services. Good luck!

Look into civilian school, dump the military! You don't have tanks because Biden left them all in Afganistan and sent all the money to buy new ones to Ukraine!