there's nothing you can do now.
When you close, you will pay daily interest from the closing date to the end of the month, shown on your closing statement. This may not be included on your mortgage interest 1098 statement you get in January 2023, but you can add it to your deductible interest even if it is not included in your 1098.
You may also pay property tax as an adjustment on your closing statement. For example, if the buyer paid property taxes for Jan-Dec 2023 on Jan 15 and you close Feb 15, you will give the seller a credit for most of the year's taxes that they prepaid but go to the time you owned the home. You can deduct those as if you paid them directly to the taxing authority even if they are not on your 1098. On the other hand, suppose the seller's taxes are due Feb 15 and you pay them. The seller will give you a credit for the days they owned the home, and you can only deduct the part allocated to the days you owned the home, even if the entire amount is on your 1098.
At this time, PMI or MIP is not deductible for 2022 or 2023.
If you pay points to get a lower interest rate, they may be deductible in full in the year you buy the home, if you meet certain conditions. There is more info here. https://www.irs.gov/forms-pubs/about-publication-936
If you pay more because the seller has solar on their home you don't get a tax credit, that's only for new installations.
Most closing costs are not deductible but they are added to the cost of the home and may reduce your capital gains when you sell, if you keep track. you can read more about that here https://www.irs.gov/forms-pubs/about-publication-523
