First of all, ordinary home cooking is ok, as long as you eat some seasonal foods, such as shredded potatoes, broccoli, tomatoes, celery and some zucchini, there is no problem.
Secondly, you can eat more soup during lactation, such as pig's foot soup, fish soup, chicken soup and so on.
Also, you can try foods with high protein content, high calcium content, high iron, zinc and selenium content during lactation.