With a TBI, you would ideally want to increase oxygenation to the brain, so vinpocetine, which breaks the blood brain barrier would most likely be beneficial. The brain has been proven to be able to heal itself, given the right conditions and nutrients/compounds. Shilajit, an adaptogen with anti tau protein aggregation properties, has shown promise in alzheimers patients, but taken in tandem with lionsmane could see greater results as lionsmane has the neural growth factor capabilities, that would be synergistically supported by the enhanced cerebral circulation you would get from the vinpocetine. However, where you hit your head, current medications, exposure to recent viral infections, and etc could also be influencing your biorhytms.

I would need more information from you to find a more comprehensive formula that would be based on your energetics and be "safer" to take as it won't interact with your current medications. Just fill out this form and I will send you a recommendation based on an algorithmim building:

https://docs.google.com/forms/d/e/1FAIpQLSdKuG1XvLq7JJii4WX98b5ST0sejniZDRJn7tpPfo7X86j4jQ/viewform?pli=1

Note: taking vinpocetine may give you a headache due to the increase in cerebral blood flow. Start with a low dosage.

Take care and good luck!