[fassssst]

Yea sign up for ChatGPT Plus and make custom GPTs for yourself. That's where you can experiment with prompt engineering (custom instructions) to solve your immediate problems in a reusable way, without having to host a server or anything.

Disclosure: I work for Microsoft; this advice is my own.

[IanCal]

Note that openai add more custom things to the prompt than you do, so you can't just drop your things into an assistant and have them work.