There is not much you can do now to increase the amount of the Lifetime Learning Credit for 2022. The credit is 20% of the student's qualified education expenses, up to a maximum of $10,000 of expenses. In most cases the qualified expenses will just be tuition. You can't change the amount of tuition that was paid in 2022. You might have some "related expenses" that can be added, but that would be unusual. According to IRS Publication 970, "Student activity fees and expenses for course-related books, supplies, and equipment are included in qualified education expenses only if the fees and expenses must be paid to the institution for enrollment or attendance."
You didn't say who is claiming the credit, you or the kids. The credit might be reduced if the person claiming it has a Modified Adjusted Gross Income (MAGI) above a certain amount. But there is nothing you can do now to change the 2022 MAGI.
You said the kids are your dependents, but you didn't say whether you are actually claiming them as dependents on your 2022 tax return. If you are claiming them as dependents, and you are claiming the Lifetime Learning Credit, and it is limited because of your MAGI, that would present one possible way to manipulate the credit. You could opt to not claim them as dependents, and let them claim the credit on their own tax returns. This would only produce a benefit if your son's or daughter's MAGI is below the amount where the credit is reduced, and they have enough income to benefit from the credit. Of course, by not claiming them as dependents, you would lose the $500 credit for other dependents. You would have to prepare all three tax returns both ways to see if there is a net benefit. You can make the decision separately for each child. This is the only way that you would be able to increase the amount of the Lifetime Learning Credit. I suspect that you will find that it does not produce any benefit.
