1) Increase your slippage, little by little
2) Increase your gas (15, 350000)
3) Remove any decimals, use whole numbers and round down (e.g. if you are trying to sell 592038493.20395, type in the amount 592038492 manually)
4) Use a different wallet (safepal, trustwallet, metamask)
5)Try lowering the amount you sell. Some coins got max transaction limit.
6)Ask the coin issuer to either lower the auto liquidity adding threshold or turn off automatic liquidity adding completely.
7)If none of the above work, you've probably bought a coin you cant sell.