Years ago I doomed my Bitcoin. I searched every device and USB from back then and found something.
I have split it into 2 different files. It is 40 characters long, machine-generated and consists only of capital letters and numbers. Unfortunately, I can only find the first file.
I have the first 20 characters. Any chance of guessing the last 20 characters because it consists only of capital letters and numbers?
If it were possible, I could perhaps rent a server. I don't want someone else to do this because I don't want to give away the wallet files. I think you can understand that.
1- I suppose you created a kind of brainwallet, composed of 40 characters A-Z 0-9, or a private key(hex) of 40 characters A-F 0-9 (case-insensitive) with 160 bits.
2- You divided these into two .txt files with 20 characters each, and for "security" you separated them by storing them on different devices.
Since you found one of the two files, the most recommended is to meticulously search for the missing file or use data recovery software. For example, if the found file is called
btc1.txt, the other one is probably named
btc2.txt.
Brute force is not viable because, in the best-case scenario, you used hex, which equals 80 bits of possible combinations.