Almost no one recoups the cost of upgrades so either sell it as is or keep and upgrade. I assume its got the old shift levers on the down tube and a old 3 x 9 groupset. If you plan to use flatbars the newer mountain bike type shifters are a great upgrade and you could keep the 3 x 9 If you want drop bars and modern road type shifter a new group set would be my choice, specifically a sub compact chain ring with a 11 speed cassette ( 48/32 and 11 x 32 cassette Have fun..