Please help with tank resealing

[Dag]

I have a 220 gallon tank - 1/2 glass on sides, and 3/4 inch on the bottom. After 18 years the front right corner started leaking.

Trying to determine if it's worth it to fix it, and how to go about it. Looking for advice, articles or other resources.

Also happy to pay someone to fix it, if they know how to do it.

Thanks.