What can be done to weak cheeks? (25 year old female). (Photos)

Thank you for your question and pictures.  Firstly, you have a lovely face, you definitely do not have jowls so a facelift wouldn't be suitable.  I think if you try tried dermal filler and fat transfer then cheek implants.  Please make sure you find a reputable and qualified plastic surgeon

You are too young for a facelift.  Usually fillers are the best option in your age group and the most natural filler is fat.  Other HA fillers will not look natural after several injections.  You may not have had a good results from the fat grafting the first time but a second attempt may take.  Placing micro fat grafts along your lower orbital rim and malar eminence would be indicated.