If no OTA is available, try:
Firmware updates for this device focus on stability and security rather than major feature overhauls. To ensure your tablet runs "better," you can use the following methods to keep the software current: firmware tcl tab 10 gen 2 better
Since you cannot install a custom ROM (due to locked bootloaders and lack of source code), you must tweak the stock firmware. If no OTA is available, try: Firmware updates